If this DIYer had it to do over he'd put the money he spent on a snapper towards a better saw. My snapper does a decent job, but rarely gets used anymore, and didn't get used at all in the shower project.
Basically I find the cutter is good for trimming floor tiles where they meet the walls. Don't have to be all that accurate, and the cut edges are covered by base molding. For a pro that's a lot of tile and the snapper makes perfect sense - time is money.
But for DIYers?
- snapper takes practice to get clean cuts, and if it doesn't snap clean it's hard to fix
- snapper only does simple, straight cuts
- snapper can't trim small amounts
- snapper not totally clean - chips from porcelain can be very sharp
- sharp edges need to be honed
- more waste from broken tiles.
IMHO, for what it's worth....