Hey hockeynut,
I'm a roller-hockey goal tender and have played with 36" Fusion's for over a year now. First playing only outdoor with them, now I play indoor mainly.
As someone has already mentioned, they are VERY durable, mine have only a few visible holes near the toes because I played outside, since moving indoors I have seen no damage yet!
Mine were second hand when I bought them but I was coming from using cricket pads so the change was huge! But still when I got worn into them I can skate in them just like when I was in cricket pads, even though they are big pads! But further to that, they are very light, so it helps when you're recovering from a save.
Actual play-wise, I'd say that the knee stacks are the biggest problem for me personally. Because my particular pads have only one knee stack (maybe because they're old), they have a tendency to bruise my knee's but it's nothing that some home-made knee stacks can't deal with

but I just haven't got round to doing it because I'm lazy lol
Anyway, I don't see any major problem with the sliding, but it's not like on ice, but what can you expect with it not being ice. Although, since I play roller puck hockey, the floor I play on is still quite smooth, so dependant on what you're playing on will obviously effect your slide.
Apart from that, they are top pads! Any further Q's just ask.
Josh