West Coast-FRA-CAI: premium vs business

Flights for my dates next year are starting to be released. For what's available so far, Condor's got the best prices both in premium and business.

I flew a 12hr economy on Turkish to Istanbul once - it was a sleepless hell. I'd love to get the flat seat in business, but it's outside my budget by a few hundred bucks. Premium's $1500 less, but I've heard it's basically "economy extra legroom" elsewhere.

In your opinion, is premium good enough? Is business worth splurging for? At a time when the eclipse's gonna make demandgo nuts, will Seatboost still be a viable option?