Ya,, honestly I feel like there are no good drum machine vst's. There are sampler versions but they are as only as good as the samples you have.... and they have less control at the sound creation level than a real drum machines. Check out Drummatic 2.2 its not bad.. but a little thin. Other than that I know nothing that comes close to replacing a 909 other than a wicked bunch of samples.

The first company that makes a vst drum machine that spits out thick drum sounds rather than thin metallic ones is going to rule the world.