Pretty great price on a 80Plus Gold PSU, with a 5 year warranty. I have an Inwin A55 (550w bronze) in another rig and I can vouch for it being a stable unit, but I never draw more than 350w or so from it (Xeon E5 12-core + GTX 1060).
Sadly I can't find a review for this specific unit, but the specs check out. Inwin is not a top tier brand but I'd rate their power supplies to be decent enough for most.
Edit: looks like the umart description was wrong, not modular