I think you may be mixing apples and oranges. There were 2 predominate problems, one electro/mechanical and the other in software. My memory may be rusty on @
mvapes' unit in particular, but other owners have opened and worked on theirs, myself included. The electro/mechanical problem was with the soldering of the leads from the heater, and that problem actually took several forms. Initially there was a design flaw, where the connection joints were not strong enough and consequently burned or broke off. Later the contract manufacturer that VXL had to terminate, was building sub-par quality units and this was one area where that poor work showed up.
The software issue was with heat regulation. This is a long, involved story and I'm not at liberty to share all the details. The software is burned into an eprom, i.e., it is in firmware. An algorithm controls the heater. It took quite a while to tune that algorithm for the desired, and equally importantly, consistent results. Later it was discovered that there was a major issue with the firmware device itself, it needed to be changed to provide sufficient power for what the algorithm was demanding.
All these issues have long been resolved. And many other changes have been made, e.g., in the cooling and the bamboo. The guts of the Cloud Plus look very different from original Clouds. And the EVO is yet substantially more different. Specific technical issues experienced earlier are not relevant to the EVO. This isn't to say that it isn't possible for the EVO to have its own issues - any product could - but these should have nothing to do with the prior Cloud issues.