Pc based drum machine

I cant find the amps and efx forum so...
Does anyone use a pc drum machine? I have seen heaps of stand alone units but i am wondering if a pc version can be just as good (minus some portability). I tried PCdrummer and it seems alright, but i just dont have any idea how good it should be. I read that some drum machines have a bass line creator thingy too. Is this useful? Should i get a standalone drum machine instead and which one?
Thanks