I purchased this laptop in the spring. Some points to take home:
- it is possible to attach a secondary 2.5" hard drive if you order the appropriate cable (available on ebay, for exact model number see my previous comment)
- No, it is not possible to add an NvME SSD - this needs to be supported in BIOS for the system to be able to boot via nvme, and this support is missing; I emailed them and the reply was that they have no plans to release an updated bios with NVME support :-(
- 4GB RAM soldered on with one free slot, which can hold up to 16GB RAM (PC4-2133, latency 15)
- Screen is not very bright as indicated in the review
- Acer website says it's possible to run Win7 on it but I've tried and had a hell of a time with drivers, so ended up just installing Win10. A shame because on my other laptops I'm sticking with Win7 for as long as possible.
Otherwise I think it's a great laptop, totally silent, runs cool, and fast. I recommend it.