Yeah I actually have. I really liked the concept, but I designed a cylinder with many holes (think a robust sieve) and it just crashed when the number of holes grew too great. Even the OpenCL/MP version. I felt it being unstable in other ways too so I did not make it my go to tool. Sadly it also seems it's not being developed much.

EDIT: Missing fillets and chamfers we're also a big problem for me - probably I'm just a newbie maker and want unreasonable things, but still.