I've played roller hockey for a number of years, then i converted to ice during high school. Now i play both and believe me switching is kinda hard for your game!
On ice i play more of a butterfly-blocking style and in roller i have a more CuJo-Hasek approach to it, reacting and trying to control the rebounds.
In roller hockey, rebounds are the worst part i think. Since the puck is lighter it has a better chance of bouncing off you alot farther. Learning to control your angles better can only help your ice hockey game even more!
T-pushes are your friend. they will be your best damn friend playing roller. It's the best way to maneuver in the crease, other than slight shuffles. I'd only use slight shuffles when i'm doing slight angle adjustments but for major ones don't shuffle or try a stance shuffle, do a t-push. You'll get there quicker but watch your 5 hole!
I've found that my X-Pulse pads are pretty decent for roller hockey but the just absolutely suck for ice! They water log easy but in roller they are light and the leather is very smooth. If the surface you play on hasn't been cleaned in a while (or dusted off) then you will slide pretty decently!
Shooters love to go high on you that's for sure. The puck is easier to flip out of the zone though! hell i get assists much more often in roller than in ice!
For me i just try to have fun with it. If you don't have fun then what's the point of playing right? It keeps you looser out there playing roller if you've just let up 6 goals
If you think like Grant Fuhr and just don't let up the GTG or the GWG then you'll be a hero!