Okay, so I just received the Greentime controller, and I must say am very impressed (although it took like 40 days). The jittery behaviour I felt from starts and at certain throttle ranges with the hua tong are non existant with this controller, very deliberate. The current seems a lot higher, but I don't have a wattmeter to give an exact figure, they say 45 or 50A, depending where you look, I suspect it's closer to the 50 range.
What was extremely interesting to me is the connections used for regen braking, If you look at my earlier post, with my Hua Tong, I used X and got reverse current, albeit for a short moment until the phase wires were shorted out, which told me that it was capable of regen, although I couldn't figure it out. On this Greentime, the regen is activated by connecting DS and X. I am super busy with midterms and such, so I won't have the chance to try this out on my Hua Tong (x may have to be connected to something other than DS), but if any of you folks want regen(very redundant), my suggestion would be to try connecting x to something other than GND, I would bet money that this is the ticket. It is activated when a brake signal is present.
https://picasaweb.google.com/104673449835553898679/Dump?authuser=0&feat=directlink
Good luck, hopefully someone else will carry on the regen flame and finish the race for everyone still using a Hua Tong!