I've tried tonnes of different strings over the years: Rotosound, Ernie Ball, Fender Bullets, Dean Markley and many more but my favourite are D'Addarios (10-46 gauge), I've used them for over 10 years for gigs but, while they aren't expensive, I've been looking for a cheaper alternative for rehearsals and playing in the house.
I thought I'd give these Harley Benton ones a try, as they are under 1 GBP a pack I wasn't expecting anything decent but I am pleasantly surprised - nicely packaged, no corrosion on the strings and no loose metal round the ball ends to stick in your hand or damage your guitar (which you often find on cheap strings). They sound good too, not as good as D'Addarios but they're a quarter of the price!
All in all - very impressed!