I signed up for the free trial, and it worked well. But it's missing the features I really need, and I don't really want to go through the hassle of using GV to somewhat get them back.
They have no filtering to fight against telemarketers - only specific caller IDs, which helps almost not at all. Most providers provide at least something simple, such as pressing a key to continue the call, which would cut out automated robocalls, one of the most common and annoying of them.
Anveo has full IVR capabilities. I tried them, and was able to easily set up something that says "Press 1 to continue to voice, press 2 to leave a voice mail". This will probably stop all robocalls, and most telemarketers, who often don't come on line until this message is passed, so they would also get disconnected.
I paid $2.80 to try an Anveo plan for a month. Not a big deal in cost to me.