ive had.....
M&P aria, which is very light and was brill when we went on holiday
Chicco ct0.4 which i didnt like much but was mainly for dog walking and it was good for that as it had huge wheels
Hauck Infinity I'coo which was fab!!! can turn baby to face either way or attach a carry cot or car seat for new born, we sold it but i regret that now and im looking at buying it again
I'coo Pico which was good but now its broken, as front wheels seem to do their own thing and making pushing buggy impossible
Gracco travel system which i hated, felt cheap and craply made, and front wheel didnt move so was like a tank to push
and we also have a cheapy argos stroller that lives in car just incase really.
main things i think are important in a buggy is, large wheels makes it easier to push over bumps up curbs etc. being able to recline for baby to sleep, and height changing handle as im a short arse lol
i do find the bigger heavy buggies better as they feel more sturdy and u can hang more shopping off it
i admit im a buggy addict and wud buy one of each if i could afford it