Sonnon's UGS or sambo-boots are just good sense:
- protect toes from injuries = more mat-time!
- protect feet from matburn
- protect feet from fungal infections
- compells development of technical footlock defences
- is more 'street realistic' for self-defence
toe & foot injury are very common, yet largely avoidable. how can boots be at all bad if they keep you healthy & training for longer? they increase the amount of time you are fit for the mate, therefore they are helping you get better at grappling.
Gatorman, your objections answered:
'slipping' -- a mixed issue. First: wrestling boots have high-friction soles, so you won't slip. but that can be bad for your knees & ankles, if you do highly mobile throws. While sambofki/UGS aren't 'slippery', they are faster and let your feet spin a bit more, which is a good thing for many Judo/Sambo techniques. Second: if in sambofki you have slightly less friction while trying to pin, then it just means you will be forced to improve faster at your transition-work. this is a good thing!
'target for submissions and take downs' -- i really don't think this is that big a deal; feet really aren't that hard to find when you are trying a takedown, they are right there at the end of his leg. And again, any 'handicap' it gives you, only makes your skill all the better
'and some tourney's won't let you wear the mat all' -- so don't wear them at tourney's. its no big deal -- the majority of your time is spent at practice, not the occasional tourney. if you feel it really throws you off, just avoid them for the week or two prior
more time you spent barefoot the stronger the feet get
-- that's baloney. you've had multiple testimonies from people getting injured toes without them, and none with them. and i see it all the time in my Judo club.