I have one and I like it very much (but I'm a gauge freak). I don't know how accurate the number itself is, as Greybeard says, since it is not submerged, but it does give you data for comparison so you know what number is "normal" for you bike so you can tell when something is then not normal. Mine has a red dot at 250 so like most here I consider that the high end of an acceptable tempurature range. Like Frank, I'm usually around 200 and I try and find some way to cool things down when the needle swings past 250. As far as checking it, yeah, checking it while roaring down the freeway is probably not the best thing to do but if stuck in stop and go (totally stopped, feet on the ground) or at a stoplight, I will glance dance and see what is going on. For the price it's a good investment.
