Worse than PyCharm. I miss PyCharm's completion. Not enough to put up with the rest of the PyCharm interface, but I miss it.
Of course, it's always possible to add some kind of setting for better intellisense, but I suspect most people don't really care too much about the disk size. What I would care about is performance impact/CPU usage.
Another potential issue for me is if adding PVTS would force the extension to be closed source like the C++ extension.
TL;DR: Definitely
Absolutely.