I fit and balance my own tyres, saves the hassle, and my spare is a full size matching wheel, meaning you won't be held to ransom by having to walk in off the street to have a tyre replaced at short notice.
You don't have the problem of fitters using rattle guns on wheel bolts, gouging wheels, or slapping black goop on the beads, or sucking air through their teeth saying "Can't fix that mate"
Anyway looking at things from a different perspective to those who berate all big chains, Kwikfit offer free puncture repairs to NHS staff
Brian