It's really pretty flexible, but not floppy and also seems pretty tough. With infill it's actually quite rigid not squishy, but it still has some give. I really like TPU for phone cases for instance - it's slippery enough to not gather lint like silicone does, but flex enough that it absorbs shock. It would be interesting to try printing this in a 2nd extruder with ABS or PLA and see if they bond, to use this as bumper material on harder prints.
I printed an experimental piece just now, a little evil duckie about 30mm tall. It prints smoothly. I heated the bed to about 50, printed on blue tape at 200. This is on the CTC and I think it's reading a bit low on temps, it's likely it was actually at 210 or even 215.
That's one knock on the CTC - I don't think they use PID on the temps at all, I think it's just bang-banging the temps, they jump around quite a lot compared to the RepRap. I really would like to port Marlin to the Mightyboard at some point if someone hasn't already done it. It would be a vast improvement (and get me away from having to use the horrid x3g files, and give control during printing - it's maddening to have to abort prints, reslice and restart if I decide I should be running a few degrees hotter or a few mm/s slower).