I got a few questions via private message about the Ghost and will just provide an update here.
I put on about 200+ dives, mostly in the Philippines, over the last two years and was exclusively using the Ghost for those. This included my Divemaster and lots of fun dives. There are no complaints whatsoever in diving with the Ghost and once you are used to a wing (I came from a jacket style BCD), I would never go back to anything but a wing.
The Ghost is perfect for travelling and all of my gear (entire set plus cloth for a couple of days but excluding tanks and weights) fits easily into a 20 kg dive bag. Mobility was a very big selling point for me when I compared several setups and I am happy I decided on the Ghost. Absolutely no complaint here.
Performance wise, I am still very happy with the Ghost as well. I don't want too many things clipped to my setup as iI prefer to dive as streamlined as possible. If you are big fan adding things to your BCD, you might not have enough options as there are no pouches, pockets, etc. The provided D rings are plenty sufficient to clip on a camera, pointer and backup SPG and that is about it.
One point of caution is that the bladder is not protected by an outer bladder and I did manage to puncture the bladder somehow after about 1 year of use. I brought the damaged bladder to an authorized dealer in Manila and had them check on it. They simply took some pictures and a video of the leak and sent this directly to xdeep in Poland. About 10 days later I received a brand new bladder. I did have to pay for shipping and some customs (about $50 in total) but was pretty impressed with that kind of support. Now, that said, at that time the Ghost was still under warranty - if that would have not been the case, an out of warranty replacement bladder would have been cost prohibitive and I would have likely bought an entire new wing (one with inner AND outer bladder!).
Bottom-line: If you need a very lightweight setup and like to dive streamlined without lots of things hanging and dangling around, the Ghost is great. If xdeep would provide an outer bladder in addition and to provide that extra protection, the Ghost would even better (there are other models but I believe not as lightweight as the Ghost).
Also, I would recommend paying the incremental cost for a Deluxe version for some extra comfort.
From my perspective, 200+ dives and 2 years later = Great Wing and highly recommended but do make sure you have full warranty and only buy from an authorized dealer.