I use this for the vibraphone and the custom, melodic tine sounds I can get out of it..
Has a very stable feel to it.. Might sound weird to say that, but some VSTi's I've used have felt fragile..
dmiHammer is cpu friendly and stable.. and the sound is nice.
I can only wish the gui was larger.. on a 1024x768 screen, the text and knobs are quite small for this synth. But I am pleased with the simple, well defined layout - Makes programming a breeze.