The multiplicity of ESCs required for an X8-build made me choose to go with the EMAX 4-in-1 units. I have used these paired-up on an AD-1 in a similar manner. Wiring it all together is a tussle – but in the end works out neater. However, the capacitors stick out from the ESC housings and are "delicate" – one came unsoldered and it was a royal bitch to re-do it. Handle with care and protect them.
I was hoping to stack my two ESCs on the "lower deck" – however – and unfortunately – the space between the undercarriage plate and the one above is just not quite enough. Consequently the EMAX units occupy virtually the whole of the first level space... Still building – but when nearer completion, will post some pics.
Re EMAX-4-in-1 units: I've read both good and bad about these and my own experience has tended to confirm that occasionally one can get a bad unit and one of the four boards can burn out: this happened on my AD-1.
The one advantage is that spares are available and they really do plug-in and out very easily. Again – beware the capacitors: I had one unit arrive with the capacitor actually rattling around in the box. HeadsUpRC – the supplier – immediately changed it out against sending back the defective unit.
If I get the lift I'm both expecting and hoping – as per the Designer's advice – I am intending to flip the camera-carrying plate upside down – for more down-clearance – so that I can fit a 3-axis Feiyu G3 Gimbal for GoPro 4... It may well be that I will need to go for some Motors with a bit more grunt than the current Emax 650 Kva driven by their currently intended 11" x 4.7 Tiger props... I guess I'lll just have to see.
Currently intending a Wookong M2 – but might just change that for something else – like the a Super X... (So far its working really well on the Octo-8 AD-1).