In reply to Alec Martin:
The dark coloured stitches are "bar tacks" and this is what gives it strength, they look just fine to me. (First pic)
The lighter coloured stitches are to tidy the ends and are not structural, they look a tiny bit tatty but still in normal range, but they don't really matter, they are cosmetic (second pic).
I'd be 100% happy if it was mine
If you are unsure, always ask..
Post edited at 07:41