I've had to send my 525 back to NEC twice to have the ear piece connector repaired. I've had many other problems with the phone as well, such as calls being dropped, but the connection timer keeps counting, the alarm clock seems to go off when it feels like it and at times the phone just shuts itself off. I'm not too happy with the battery life either, it seems to drop off quickly once it reaches less than 50%. The poor memory capacity was the last nail in the phones coffin though. So I went and picked up a Moto v600, and keep the 525 around for a spare.
I do like the screen and it's size though, and I love the 2nd display caller id too, so I may look at the 535, but I'll also look at the Moto v3 and MPx220.