FSI is the leader in training, but more specifically for aircraft types... i dont know anyone that went to them for overall training, but i do know people that have gone there for type ratings and initials in corporate and private jets. the one in teterboro is pretty nice and is set up well, but i dont see how getting your private or instrument will be any different... costs are high for type ratings and initials, but worth it because of the name... DCA and ATP are starting to have a black mark against them but FSI should stay good... i am going there in august for initial in the 800XP and i am pretty confident in the training
downsides: at least from the jet perspective, i think its hard to get sim time.. i know people that get sim time from like 3- 6 AM because thats all thats available...