1. The 11 toestraps aren't for everyone, they'll work, but they take a while to dial in. Some prefer them, some don't....I got mine to work, but felt more comfortable with the DLX toestrap.
1a.) BOOTS are the most important thing in your setup. If they cost a lot, but fit great, pay for them, don't fuck around and get some shitty boots, trying to save for a board or bindings. 90% Rider 10% equipment, but shitty boots will ruin your life.
2. (Back to the thing at hand) Yeah, they'll fit 11's no problem. All their toestraps are compatible with all bindings. I have some 12 toe-straps on my 09-10 forces, they're amazing, conform to your boot and will NOT come off. I was skeptical that they'd be better than my DLX straps, but after 3 days they have wrapped around my boot.