I saw one of these used in a local camera shop, so since I was passing I dropped in to check it out on the 5D2. I didn't give it any detailed testing, and only tried it at 24mm from f/2.8 to f/8 and 135mm f/4.5-5.6.
At 24mm, f/2.8 is quite soft, getting progressively sharper to f/8 where it was decent.
At 135mm, again it's a bit soft at f/4.5 and gets a bit better at f/5.6.
Since the sample had a slight focus offset on my body, I used manual focus in magnified live view and didn't check out the focus speed.
At just under £150 used I think it was ok value if you want a budget lens for a full frame camera. Perhaps better suited to an older, lower MP count model. I decided to pass on it though, and will aim for something a bit nicer later.
_________________Canon DSLRs: 7D2, 7D1, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 10-18, 15-85
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 50/1.4A, 150 macro, 120-300 f/2.8 OS
Compacts: Sony HX9V, Fuji X100.