Hey man, the M80 Plus is a bit of old news. It was actually my first regulated box with a Herakles tank, that was a pretty great setup. If you were thinking you really wanted the TFV4 for whatever reason, you're going to want a device with higher wattages, as the TFV4 can run up to, I believe, 130 W. You'll want the option just because, believe me. If you bought the M80, I'd suggest either a Herakles or Arctic tank, maybe a few others too.
Just keep in mind the M80's "temperature control" is extremely wonky. I would not sell am M80 as a TC device, because it pretty much just doesn't work. Great for the regulated 80W though. The CMK (cloud machine kit) is the new SMOK X-Cube 2 along with a TFV4, and that's an option you might be interested in at a relatively cheap price. There are a ton of options based on your preferences. Let us know of you have any other questions, and good luck!