I have been using PET+ a lot, I definitely feel it is one of the best filaments for 3D printing. Like you said prints just like PLA but has a much higher heat resistance and seems much stronger. It also doesn’t absorb moisture so storage shouldn’t be an issue, at least it hasn’t been.
I’m not sure if there is a difference between PET+ and PETG, a quick Google search didn’t bring up anything obvious.
Than link you provided brings the price down to manageable, I’m ordering some for sure. Thanks