In addition, the Scottish Government only charge you for three years, so the price is something like 5.5k rather than 10. Glasgow is a relatively affordable city too, even the plush West End will get you a flat share for £250 a month if you look around, certainly change out of £300. A friend of mine from England went to Glasgow, and estimated (even with the the extra year's rent/living expenses) that she was nearly £4k cheaper, and with an extra year of student life, than her other family members who did a three year course in the south of England. That's not bad, in my book.
England are still a bit behind the times when it comes to Glasgow. Edinburgh and St Andrews are seen as very acceptable places to be, but they've still got the 60s and 70s image of Glasgow (when most parents/teachers were thinking of university themselves) of the city being a hell hole. Crime is still high in certain pockets, but thankfully these are well away from the university (the complete other end of the city actually), and the rest of it is no worse than anywhere else in the UK- the West End is one of the safest and most affluent areas in Scotland, as it so happens.
Because of this, the English presence isn't as big as it is in Edinburgh or St Andrews, where Scots/English/Internationals are not far off being a three-way split (Edinburgh is 30% England, St Andrews 35). 70% of the university is Scottish, with just over 10% from England- most of the non-Scots UK students are Northern Irish. About one in six is from outside the UK though, and of the 4000 who stay in halls, nearly half are from outside Scotland. In other words, its got a more Scottish feel than its Edinburgh or St Andrews, but most of the people you interact with won't be locals.