I have mods that cover the price spectrum, from a Sigelei 50W to Paranormal 250c.
Of all of the (Wismec and EVic included), I have had the most trouble with mid-price mods.
It isn't expectation, my cheapest mods are still working fine when I take them out of storage. Some of the failures were battery doors (or caps) on Yihi mods, fire buttons on Aspire and Modefined, way wrong TC on several.
My HCigar mods are all still great, my sole Lost Vape has survived its initial month, My Vapecige Creator 75c is very nice.
I've yet to have a 510 or screen fail on any mod.
HCigar has a special spot for me as I have 5-6 VT133/166 that have went everywhere with me.
Yihi has the opposite end of the stick, out of 6 then 'top of line' I still have 3. Two were returned after a big hassle with Yihi, one I took out back and beat to death with a hammer after it refused to fire 4 different tanks. Needless to say, it doesn't give me any problems now...