>>381269776
As far as I know there is no difference with the newer Q2s, they just stopped selling the 64GB.
The cable I used was 6m and that already has one of those 'active' repeater blocks in it to keep the signal strength up the 15m one is probably alright, I can't say for sure but it might be pushing it. If you have to drill a hole in a wall I think you should just get a big battery and use airlink/virtual desktop for wireless. That's all I use now. I'd probably get the new one for the extra 80 just for the warranty but that's up to you.