A good friend of mine rides the bontrager r3 tubeless with sealant , on the two times I've been out with him & he punctured 1 sealed ok with sealant the other time with a small tack it didn't .
Very messy & hard to get the tyre off & fit a tube 60 miles from home
So I'd say tubeless are good but not total protection
Are the Schwalbe Snow Stud (currently cheap on px) worth having around the house (on a spare pair of wheels) in case there is a period of prolonged snowiness (my commute is 95% on uncleared cyclepaths) or are the sufficiently inferior to the much more expensive marathon winter to not be worth it.
A good friend of mine rides the bontrager r3 tubeless with sealant , on the two times I've been out with him & he punctured 1 sealed ok with sealant the other time with a small tack it didn't .
Very messy & hard to get the tyre off & fit a tube 60 miles from home
So I'd say tubeless are good but not total protection