Yeah, got to agree that tampers are personal!
I currently own a gorgeous checkerboard-handled Greg Pullman
tamper and a convex-bottomed Espro. Truth be told, I'm using the Espro the most, mainly because it fits my hand like a glove ... but it is also useful in preventing that slight drift in variables that seems to happen at home. You know ... you start off with a 27 second double and by the end of the week you're pulling a 33 second double ;p The Pullman tamper is very dear to me though, as it has gone back and forth between Greg and I and is a product that is being constantly improved upon.
If I were buying a tamper for a cafe, I'd probably grab an Espro for the ergonomics and the way that it helps to stop RSI. If I were getting several tampers for use by staff, I'd probably go for a tamper with removable rings to adjust the height of the handle to accommodate different hand sizes. The Coffee Lab Design
tamper is fantastic for this and I gather that Impod and Expressivo have recently added removable rings to their repertoire.
For home, if I had to choose one, I'd probably go with one of Greg's tampers, but I'd fly over to Adelaide and get the handle measured to fit exactly and I would choose a good double basket to use, buy a few of them and have the base custom-machined to fit.
Dan, I wonder if Espro haven't changed the 'click' mechanism oh-so-slightly ... mine doesn't make an audible sound at all.