Hello there, I own a Belkin Thunderbolt Express Dock!
I can give you a few impressions, if you like:
- first of all, if you do not use external SSDs via USB 3, the connection speed is sufficient. I got roughly 130 Mb/s out of the stock MacBook non-retina HDD ( there were several devices connected to both the dock and a Hun that was also connected to the dock, for example my mouse, another HDD etc. )
- you can daisy chain a monitor to the dock. I own a Dell UH2713M which worked quite well. No problems so far, albeit I have to admit that my MacBook had a few issues with thunderbolt
- sadly, I cannot say something about the power of the USB ports since I only used active components ( a hub from Anker and a 3.5" HDD )
I hope that this helped you a bit ☺
Regards.