For those interested, there’s a post in the support & troubleshooting section now showing the warping problems.
To the OP:
If you’re doing armatures and gears larger than maybe 3cm in diameter, need lightweight assemblies and a perfectly smooth surface direct from the machine isn’t a problem, an Ultimaker should work well, but if you need precision tolerances on really small gears and components (and maybe you want to model threading into the parts), maybe the Formlabs would be better. (Note however that my own experience with the F2 so far has yielded unsatisfactory results with “longer” models than around 8-10cm. I have not yet been able to solve the warping problem on those models.)