Just back - thought I would provide another data point as of 6/6. I'm 5"2 and just under 300lbs, busty, lift weights so have fairly muscular calves + circulation issue in my left leg so it is larger than my right. I FIT! Back restraint was no issue - even though I'm short my chest was well above the front support, and I wasn't even aware of the back restraint really. Right leg had no issues - didn't even feel the restraint. Cast member did come over to me and maybe gently pushed the left restraint? I did follow some suggestions from here - scootched all the way forward, went up on tip toe so that it hit lower on my calf (not the thickest part).
I didn't see the tester seat (it was at night and my teenager was hustling us into the line because it was record-breaking short due to all the rain that day), and I wasn't that worried about it - I would have stood in line with my kid anyway, then just bowed out at the end if I didn't fit. I warned her that I might not be able to ride, so she wouldn't be surprised if I had to leave the room. As it turns out, if I hadn't fit the "walk of shame" would not have actually been that bad - only 16 people per room and the rest of the line can't see you.
Its a great ride! The position wasn't at all awkward, even with my short arms, no pressure on my knees at all. Completely forgot there were any restrains once the ride started.