-- fitter wont fix once used it (the slime that is)
there is the point, why when obviously at home would you put £10 shit in your tyre when 10 mins spanner spinning has a wheel you can take down and have fixed correctly, and not cost another £xxx for a new one
(pretty sure having all that extra weight in your tyre would cause some issues aswell)
(slime is a great emergancy repair if i was down my uncles 300miles away on a sunday and needed to get home but had a flat from a nail i would use it but if im anywhere in cumbria i wouldnt, i would find another way)
Because as i said before, i'll only use it if the tyre is not new, or in an advanced state as it were, plus it depends what part of the tyre the hole is in. If it's the fleshy part this stuff works just fine, if it was a hole in the tread part then i'd certainly consider a plug without a doubt if the tyre still had decent tread on it.
Not sure what you mean by "all that extra weight", i've never noticed any balancing issues at all, but then again my bike is mainly for commuting so it certainly works for me, and will obviously protect against any other unfortunate punctures. If i get a second hole, at least i can ride the bike straight to a fitters, rather than standing there looking at a flat.
Each to their own i s'pose, but i've used it about 3 times now, over many years, and it's done a good job as far as i'm concerned whenever i've felt the need to use it.