Love it!It comes with the thunderbolt cable which costs a fortune when you buy it at Apple.The base adapter is excellent.You can easily attach any SATA drive to the base adapter and enjoy Thunderbolt speed.I also have 2 other Backup plus drives that has detachable adapters to USB3 and mini-USB.This makes them fully interchangeable.I tried time machine back up on 2 different macs.A new iMac (6 month), back up of 550GB, took less than 3 hours.An older Mac mini, (18 months), backup of 500GB, took less than 5 hours.As for regular save and retrieve, it is very fast.  Much less lag compared to the USB lags.I'd recommend this, but the price is a bit high. 

Question: How is the design?
Answer: base adapter is excellent