It depends what you use it for and what countries you call.
I use it mainly to call UK landlines and non-geo numbers, but I also have a UK skype-in number, which I really didn't want to lose, so I've switched over to Voipfone.co.uk
At the time, (about 3-4 weeks ago) it was the only one I found that had non-business packages that would allow you to port in a UK Skype number, but more might have popped up since then.
The call package I've got is practically the same as I had with Skype, just a little more expensive, but they ported my Skype-in number with no fuss. But it's meant for business really, and I have to use 3rd party apps (e.g., Zoiper5) to make calls. They are clunky and awkward, and I don't like them at all. But the calls are clear enough, and calls on my UK VOIP number come through OK, so I will stick with it for now. So, not a glowing recommendation, but it does what I need it to.
When I was looking, there were a lot more options for users in the USA.