You and me both. I've been toying with buying one for years but the sum total of my knowledge is more what they can do rather than how they do it, so I have no idea which one would suit my needs. And, as they're not cheap, I can't afford to get it wrong. I even got round to building a suitable bench for one years ago but that's where the project stalled. I'll be following the advice that Stu gets with great interest.