I have bought wheels and multiple rims from Speedsafe. Everything weighed exactly what they said it weighed. Wheels were tensioned and trued excellently--no complaints there. Rims are very high quality, handle a beating. Customer service is excellent, fast, responsive. I have never had to file a warranty so I don't know how that would work, but ordering through Aliexpress is pretty hassle-free. Shipping time is a bit slower than generic parts, but given that it's a large package and not sent by EMS I wouldn't gripe about that.
Speedsafe seems to know the market, they even pre-build wheels with HyperBoost hubs. Not a lot of people also worry as much about weight as they do. You can get wheelsets built with Pillar X-tra Aero spokes, ultralight T800 carbon 29er rims, and DT Swiss 240 hubs for cheaper than it would cost to just get the parts at dealer pricing and build it yourself.