It is good, there is a big thread about it on here somewhere, its well worth buying the full game and also buying the extra tracks too, I can't do any of the expert levels at all, its bloody hard!
Got it the other day and played it for a bit. I got pretty angry at it but at least you can retry instantly. I think I just need more practice. Some of the levels are pure evil though and I don't think i'll ever do them without faults