Is RealESALetter.com a Good Place to Get a Legit ESA Letter?

I recently heard a lot of good things about RealESALetter.com — people say they make it really easy to get a legit ESA Letter that meets all the legal standards for housing and travel.

Before I go ahead, I just wanted to ask if anyone here has personally used their service?

Was the process as smooth as they claim?
How long did it take to get your letter?
Did your landlord or airline accept it without any issues?

I’m thinking about applying soon, but I’d love to hear from others who’ve tried it first. Any honest experiences would help a lot!