I bought a Coilmaster 521 TAB from one of the recommended hardware sellers back in September which has just failed (ohms reader all over the place) Have sent them two Emails asking them what, if anything, can be done (replacement, fix, tough luck mate) and not as yet received any reply. A bit annoying. I have not named and shamed as yet because maybe they are unable to respond to my emails at the moment. I want to make sure before I diss that I am in the right to at least expect a reply if not possibly a replacement?.