i used to use Obo as well i cut the hip protector out they asted me 2 years they were very good if not a bit bulky.
I like the remfry because after a while they feel part of you because there so thin and having used mine for 3 years now there in still great nick i even put mine in the washing machine and they came out looking new.
The feet in motion were bulkier and i have no doubt offer the same protection (i used the thigh guards for around 3 months) but found them to be like other thigh pads and very bulky and cumbersome.
It really depends what you like i'am the kind who likes small yet tightly fitted pads and gloves including thigh pads and i like them as thin as i can get them.
If you do not mind a little bit of bulk then the ace are fine but there not that much into it.
I know i go into a bit sorry but to me protection is a very big thing you do not want to spend a day at Airedale if they do not work