The slim models, from my experience are rather durable.
Have had one since it first came out, and despite all the rough shit it's gone through. It's still kicking strong and playing my games.
Seriously
1. Dropped it seven times from its spot, 3 from me 4 from my girl, butter fingers...
2. Soda semi drenched, waited 2 days, works just as before.
3. Of one of the times it fell, it landed where the ps2 mem card was. To this day I have to nudge the card a bit to the left in a crooked fashion to make sure the PS2 picks up the memory card. No mysterious wipes though.
4. Lent it to a friend once who took it to a friend of his which, for fucking sakes had a god damn roach infestation... Soon as I saw it back I swore I wanted to fucking strangle him for that shit....
Wrapped it in plastic and waited the fuckers out. 2 weeks later I'd taken the ravaged slim ps2 out and shook it wild; roach carcasses & body parts floating out from its exhaust. Used Compressed air to further clean it.
Works like a charm.
Moral of the story...
NEVER GIVE YOUR CONSOLES TO YOUR FRIENDS, EVER! UNLESS YOU'RE SELLING IT!
>:L