1. They have frequent flat wheels, moreso then the M1s that they are replacing
2. They have ALREADY needed new trucks, and i beleive the first 100-200 have been retrofitted
3. They are loud due to their lack of soundproofing. The M1s are also loud, but that is because they have lighting fixtures which rattle
4. They are REALLY heavy-- 35000 lbs more than an M1 each, with a capacity of 20-30 fewer people
5. They have unreliable airconditioning. I have been on an equal number of M7s with bad AC and M1-6s with bad AC (I have been a life long rider of the LIRR Babylon line, and frequent the MNR new haven and hudson lines)
6. Even when it IS working, the M7 AC doesnt work as well as those on M1-6s
7. They look ugly, but thats just my opinion
8. Their ride has a strong resemblance to that of the old P72/P75 Pushpull cars.