I've flown the T134 a total of 51 times on 10 different Russian airlines. Some interesting facts about them:
1) Some of them (maybe all, I can't remember) have windows in the lavatories. Granted, the windows are small portholes, and they point almost right upwards, so you can actually see a piece of the tailfin there. SK
claims that they were the first to introduce windows in lavatories, but this is far from true.
2) Some of them had rearwards facing seats, but only the first row.
3) I noticed several times that I flew the T134 that when lining up on the runway, the pilots put on maybe 80 percent power on the engines (which was quite noisy), then lowered to maybe 40 percent power, before going up to 100 percent power (very noisy!). Only then did they release the brakes. I have no idea what this "test-run" at 80 percent was for.
In Y-class, exactly same type of seats as on T154 and all other Russian jets, which are not very comfortable. Seat pitch was also horrible, except on row 13 (emergency exit), which had seat pitch almost like intercontinental C-class. So row 13 is the lucky row on the T134.