I don't have any flight training loans, but my undergrad degree loans were/are with Sallie Mae. From that standpoint, I have nothing but good things to say about them. Very well organized company easy to sign online and check your payoff, etc.
My flight school promotes loans through Pilot Finance, I took a look @ their brochure, interest rates = ouch! It'd be like financing on a credit card then paying off just a bit at a time. That'd make for some expensive ratings, totally negating the cost savings of flight training at a Part 61 FBO.
Given that I do have a college loan out there (almost done, woohoo!) I'm going the debt free route. It can be done. I just work my butt off to pay for flying. So far I've paid for 210 flight hours out of pocket and I'm still standing.
Definitely slower than taking out the loan, or going to an academy. I'll finish my Comm probably end of Feb., about 20 months after I first started flying. But I keep on going steadily, and that's enough for me.
Sarah