I've bought many mods over the years. Here are the two I'll always buy, not because they break, but because I can hand off my still-functioning older models. I've had little to no issue with either mod maker and nothing of note on the mods themselves:
REO (Grand, VV, VV Grand, Mini, woods and metal) - Rob has engineered a great mod for handling just about any juice situation.
ProVari (Original upto the newest) - Between my wife and I we've bought 6 ProVari mods, the two newest we use while the previous 4 were handed off to fellow vapers in need.
These two products spit in the face of
planned obsolescence by returning to older values of craftsmanship (durability, intelligent engineering with the end-user in mind, quality materials)
My trust in products, when I first get them, is thin. It takes a few years of hassle-free operation to engender a review like this from someone as picky as myself.