I have Private Internet Access (PIA).
https://www.privateinternetaccess.com/I used to use Anonymizer but had occasional issues with it, so I tried something new. When it first started using PIA, there were a few sites (oddly, Barnes and Noble, among others) that it had a hard time connecting with. It also occasionally didn't play well with my email client and the synchronization on my Kindle app. These were infrequent problems. However, a recent switch to a new and improved client appears to have eliminated even these minor issues.
The experience of using PIA is now smooth. I don't even have to think about it most of the time. And, for whatever advertising claims may be worth, it claims to keep no records of your internet activity whatsoever. That means even if PIA's servers get hacked, there's no information about individual users that can be compromised.
As I suspect is probably true with using any VPN, you will need to go through the new device routine with some websites, such as banking websites, but typically, that's only a one-time thing.
Occasionally, connection speed my slow down. Disconnecting and reconnecting the VPN normally solves the problem--if it's VPN related. Depending on your hardware, sometimes the problem may be modem-related and require turning off the modem and then turning it back on to reinitialize it.