Yes, the DIMM sockets have a lock on one side only (I was surprised to see that). They seem sufficiently secure. Installing the DIMMs works the same way as usual.
I am in Australia, and I bought the motherboard locally.
The machine has been working flawlessly for three or four weeks.
i bought new p8z68-v in india new delhi, nehru place, SMC international and after purchasing i found that there was problem on motherboard that when i press power button first time system didn't start ( i mean when i try to do cold boot ) it was not starting normally and pushing me to bios.
then i found that CMOS jumper was missing from my motherboard and i was facing this proble due to that missing jumper so i pulled the jumper from my previous motherboard and put it into my new P8Z68-V and now it's working very stable and cool.
So anyone who buy P8Z68-v should check cmos jumper in their motherboard because ASUS is missing that small jumper when assembling motherboard.