It is a fantastic multi effects unit for the price. I used one live and in the studio for about 3 years and it didn't fail me once. Have a quick search on this forum, there's loads of golden info about it on here.
I left my board at Uni last year but had a gig to do so I took this instead and fell back in love with it. I've since gone for single stomps, but don't let that detract from what is a brilliant pedal. I especially enjoyed being able to assign the expression pedal to any parameter and having such a diverse range of effects available. I loved all the modulation effects, especially the choruses, the delays were great too, however many gripe over the overdrive and synth sounds: although I agree that the Synth module is limited, I still used it well. With regards to the overdrive section, I think that such a criticism is completely unfair. In fact I still come back to the fuzz patch I created every now and then as it reacts very well with other overdrive pedals I use and has oodles of lowend,
For the price, expect £80-100, I don't think it can be beaten. Would I go multi again? Possibly, but I'd get an M9 and not use the overdrive section, incorporating it with my current stomp setup.