Doubling transfer speed between to mac mini was totally worth the cost of a high quality cable from startech.
I was getting fead up waiting hours backing up 20tb of data from my mac mini server to another mini with the backup disks over an antiquated slow 1gbps ethernet connection. I worked in the it business for more than 20 years going from cat. 4 to 5 to 5e to cat. 6 cables ready from the 5e to handle fast speeds when faster ethernet switches was said to be just around the corner, but it never panned out and we are still stuck with a very slow connection compared to speeds of raid systems and fast servers, but those slow ethernet cables slowed everything down and some of the biggest clients saw no other option than to switch to a faster but very expensive optical network, that was high cost 15-20 years ago and still is expensive today. I really expected to see some faster ethernet switches with the new high quality cat. 6 cables, but all we gained was longer cable lengths with the same slow 1gbps, so when apple went to intel with their new thunderbolt standard, i was excited and saw a fast and less costly way to set up thunderbolt networks from 10gbps and up, but intel that was chosen to make the hardware, has still not made a hub/switch for thunderbolt networks even though my macs are ready for it with support in the os, so i finally had to choose a thunderbolt network between the mac minis to speed things up and i knew i would not get speeds even close to 10gbps with a mac with only one thunderbolt port occupied by a thunderbolt hub to connect esata raid and usb 3 enclosures all sharing a thunderbolt 1 with maximum 10gbps fighting for some of the bandwidth and did not expect to see transfer rates above 200mb/s and my laptop cant use thunderbolt to connect to the minis with no way to connect more than two hubs together - no where to plug it in until switches are on the market. It has only been connected for a few days and so far i have had peak rates up to 189mb/s almost doubling the transfer speeds compared to ethernet. The cool thing about mac os x is that it can handle as many networks as you want to it and it can use all of them at the same time but it requires a setup that gives one type of network first priority and so on down the list. You only have to give the networks different private ip's and the following works perfect for my minis: priority 1 is ethernet on both with static setups that receive and send any traffic to my router for internet connection. Thunderbolt is set up with different static ip addresses, but only what is needed for data transfers between them, so no dns setup is used, just ip, subnet and router ip that is the thunderbolt ip address of the other mini and the reverse on the other mini. Priority 3 is wifi, 4 is vpn, 5 is bluetooth and so on, so although i never expected to have access to the 10gbps bandwidth, i am pleased with doubling the speed by just buying a high quality 3 meter thunderbolt cable like the startech.