Well, as much as I'm enjoying the espresso from my Gaggia Factory, I for one am especially enjoying the "toy factor" aspect of the experience... and a naked p/f, if nothing else, is one more "part" to the toy...

Simply put, the naked p/f is fun to play/tinker/experiment with... though I do find myself pulling more shots using the spouted p/f than the naked p/f - mostly because my wife and I usually like to split each shot...
OK, on a more mature note than the "toy factor", in addition to being an educational/instructive aid (and fun) when pulling, the naked p/f has been an especially invaluable aid in dosing... Even when I plan to pull using the regular spouted p/f, I grind into the basket with the basket in the naked p/f - it's much easier to keep the basket firmly pressed against the Ascaso i-Mini grinder's "slippery" little power button when the basket is in a spoutless p/f than when the basket is either not in a p/f at all or is in a spouted pf (the spouts get in the way...) Plus, when grinding into the basket in the naked p/f, it's much easier to gradually rotate the basket w/in the naked p/f to keep the grounds more evenly distributed... rotating the basket inside the spouted p/f while keeping the spouted p/f firmly pressed against the grinder's slippery little button requires no fewer than three hands (again, as the spouts are always in the way). I then tamp with the basket still in the naked p/f (also much easier/smoother than with the basket either in the spouted p/f or in no p/f at all). Only after the basket is tamped do I transfer the basket to the spouted p/f for the pull...
All-in-all I'm very glad I spent the $$ I did on my naked p/f... but I can certainly understand MattB's perspective.
r-gordon