/diy/ - Do It Yourself

yeah, he complains about the relevant issues... although personally my above-jhead piezo system was pretty much ramming the aluminium bed; i had it moving quite fast and i'm sure glass would have been fine. Also the speed issue he complains about is just him being dumb: fast XY motion is irrelevant as long as you pause before probing Z.
Filament was never an issue for me either, I just probed and after heating bed and nozzle, extruding 20mm off the side of the bed, and then bed-meshing immediately before each print, any PLA dribble was smooshed until the nozzle touched the bed and it never made any difference as far as i recall.

...and the price. Yep. The price has always been an issue.

Maybe try the under-bed type first if you go the piezo route.