I've a modest Alesis kit (Nitro Mesh...) which I use to trigger a modest laptop, loaded with Superior Drummer 3. A great sound, and fun to play. The important things to look for..? Cymbals don't react like metal ones, so one has to adjust one's style, and the hi-hat, too, has a very different feel. It won't replace my Camco kit, but it's darned good. The whole thing (s/h kit, refurb laptop, software etc...) comes to around £1000. Good cymbals start at £200 or so, alone, so it's good value, I reckon. Yes, there's better stuff, but my Vst drums would be hard to beat for sound quality.