I have 2 ZooMed Reptitemps and they have been great. The only issue I have is the probe wire is EXTREMELY thin so you can run the risk of snapping it in half if you're not careful. They recently dropped in price too so they're running at 30-40$ on Chewy. There seems to be a lot of hit or miss reviews on this one though.
I also am running a VE300x2 - This is the one that has me scratching my head. Every now and then the temps just drop below my threshold on one source and it it will alarm just fine. I just still am trying to work out why I have this issue every few months. I'm in Southern California, so the temps are 'fine' if there is a lack of heat. So It hasn't bothered me there... but I'm starting to wonder if it's a faulty thermo and not feeding my heat tape enough juice at times. The 2nd probe/heat source always runs like clockwork.
No issues with the California brownouts and blackouts with either at least. =D