Had it for about 2 weeks now. Here is what I found. 1. Fan is quiet as a mouse and cycles like it should. No high fan noise at all. I can't even hear it run but air flow changes at times so i know it is working. 2. Wake up screen display after standby works as it should. Looks like new M400's have the motherboard fix already done. 3. Zero hot or stuck pixels. 4. Latch works like it should no problem like some reported. 5. Added 2nd HD and run mirror software on it. M400 is just as fast as before when using 2nd HD in multi-bay. Man I love this no more backups needed. Not any slower as with just one HD as far as I can tell. 6. Love the docking station I also got. Also got a couple of extra batteries + duel battery charger. BTW the Kensington 120 watt ac/dc/air charger is fantastic. I got it to use in my airplane. The N1 adapter is the one you need with M400. Bottom linef all the reported problems on M400 reported here I have none of them on this one.