I saw Interstellar tonight, in IMAX. I'm still digesting the movie, but I'll say that the last 30 minutes or so do require some pretty heavy suspension of disbelief, but that's not necessarily meant as a negative. Technically it's deeply impressive, not quite in the same league as last year's Gravity but still with plenty of striking shots and moments.
This was my first time seeing a movie at the Assembly Row IMAX theater, and I was a little underwhelmed, especially considering the ticket price ($17.50). The screen is only maybe 50% as large as the one at Jordan's in Reading, and there were a few times during the movie when the music was loud enough to obscure dialogue. Now that could just be how the movie's sound was mixed, or it could have something to do with the IMAX sound system.
I will say that the stadium seating lets you go up about four rows from the entry aisle and be vertically at the middle of the screen's height, which I find is ideal for seeing IMAX movies. And if you go to one of the earlier showings in the day it's cheaper; I think the first two shows are $12. (I just checked and for comparison, all the shows at Jordan's are $12.75.) If you can't get to Reading and you don't want to go downtown the IMAX at AMC Assembly Row is a decent option: it's T accessible, the theaters are clean, and the staff is pleasant. But with IMAX, I've found that bigger is better, plus you can get Richardson's ice cream in Reading.