It is a puzzling "feature" of the Belkin, but as I am transitioning to my new 15" rMBP as my main computer, I couldn't keep waiting so I bought the Belkin. So far (touch wood) it works just fine, and I don't have any USB3 devices that exceed 2.5Gbps anyway. When I get around to deciding on a desktop storage solution for stuff that doesn't fit on the MBP SSD (using my old MP as a file server for the moment), it will likely be TB anyway since it will either be a Pegasus J4 or one of the 4 bay TB 3.5" RAID boxes.
Aside from USB3- implementation, I don't understand all the hate it seems to get. I am running ACD, USB3 WD Passport drive, USB for the hub in the ACD and ethernet off it with no problems so far. Also tested the FW port - all good.
If Caldigit ever ships at $199, I'll jump on one of those as well since FW is not essential to me any more (I can always use the TB-FW adapter). I would even pay another $100 if it was TB2, although for my purposes, I doubt I would saturate a single TB1 channel with only a 4-bay RAID, single display. Any other USB3 drives will be occasional use things and I can just temporarily use one of the ports on the Mac directly.