This is a fantastic cooler with a poorly engineered mounting system.
Fwiw: i am using a 2600k overclocked to 4.4ghz, and was previously using a corsair h60.I'll get right to it: the assembly itself is straight forward, but i'm decking it a star because the mounting system is terrible. I'll get to that in a minute.If the cooler happened to not come with instructions, you could fumble through it and figure it out. The plastic bracket for the back of the motherboard is fairly confusing. The bracket is labeled "intel" and "amd". Don't look at the pictures in the instructions and just look at the thing to figure it out how to mount it. (if you're mounting it on an intel cpu, have the word "intel" facing you if you were looking at the back of your motherboard). As well, the bracket is plastic which is a blessing and a curse. They include two-way adhesive stickers so you can stick it to the back of the board. Metal would be better, but as well heavier and render the adhesive strips useless. After mounting the bracket, you'll need to put the threaded pins through the mounting holes on the bracket, which in turn feed through the mobo. I'd strongly recommend super gluing (or using strong tape) on these threaded inserts. You'll just end up pushing them out when trying to screw down the cooler since they don't really "lock" into anything on the bracket.As for the mounting of the cpu cooler itself...Oh boy...Where to begin...The cpu cooler itself has a metal bracket that you must slide little metal adjuster things on, depending on whether you have an intel or amd board. It's probably the worst designed thing i've ever had the pleasure of dealing with. After choosing amd/intel on the sliders, you clip the bracket onto the cooler and feed screws through the bracket into the previously mentioned pins in the plastic backplate.Those little levers i mentioned above? There doesn't seem to be a way to lock them. It took me (i'm not exaggerating) about an hour and a half of fumbling before i was able to get the sliders to stay in the intel position and the metal pins in the plastic backplate to stay in place before i finally was able to get a single screw threaded through. After that, i was able to (fairly easily) get the other screws in and wrap up the install.If i had to do it all over again, i'd absolutely have a tube of superglue with me to glue both the metal bracket into the intel position, and the metal pins to the plastic as well, remember how i said the plastic backplate is a blessing and a curse? I mentioned the blessing part (adhesive strips), but the negative part is the threaded metal pins...It's super easy to "over-tighten" the screws and the metal pins to pop out of the plastic on the back and just free-spin. This could easily be fixed if antec included brackets for each of the sockets it supports instead of the universal one that is cumbersome and annoying.Performance wise, it cools way better than the h60 (as it should, since the h60 is 120mm vs 240mm)the antec logo on the cpu cooler itself contains a led, which can be controlled by the terrible software that's included with it. The software works, it's just hideous.If you were to start a stopwatch from the time i popped off my h60 and finished screwing this new one in (stopping the stopwatch during times of frustration when i just had to get up and walk away from the thing), it probably took me a little over two hours.Unacceptable in my book, which is why i decked it a star.I would strongly recommend superglue and/or a friend to help. You simply need more hands to hold everything in place while you work.Edit: after writing my review, i looked for other reviews on hardware sites. One of them mentioned little plastic clips that you can wedge between the amd/intel levers so they don't slide. Sure enough, they're in the same bag as the backplate adhesive strips. I'm leaving my star deducted, as the manual doesn't mention these little clips at all. As well worth noting, the pump makes an audible hum while it's running. I tried orienting the cooler a little bit differently (as well as the radiator) and it doesn't seem to make a difference. I'll update if it gets worse/better.Edit 2: the rattling is starting to drive me insane so i opened an rma with antec. Pretty simple. They required an invoice from when i purchased it, and then i had to call into their support line and provide credit card info so they can do an advanced rma. (aka they place a hold on your card and ship one immediately, so you aren't sitting without a cpu cooler while it's in transit. I'll update this with my findings on the replacement when i get it.Edit 3: the replacement i received today seems to work fine. Installation was just as annoying the third time around as it was the first. Now i have to pay return shipping back to antec, which works out to about $17 for the slowest/cheapest via usps (the unit is over 5 lbs.) as well, i have never been able to reproduce the same temperatures i got when i initially installed the thing. I'm running about 5-6c hotter now than when i initially installed the first one. I doubt this is the fault of the cooler, but probably due to poor ventilation in my case combined with warmer temperatures. I'll keep an eye on it.