They are a mixed bag. When they work, they work great. When they don't, Kevin will keep tweaking until the tune is of your liking. The only problem is you Uk guys will dump a ton of cash in shipping costs. CVI used to do all the distribution and service work in the UK and such, but they closed up on ya.theboy":1y4o5xqy said:I had a shock 'serviced' by them about 8 months ago which cost me about £75 including shipping to and from the US, they were quick to respond to emails, and sent it back soon enough, but the shock came back worse than it left and the only movement anyone got out of it is when it blew. They also ignored all subsequent emails.