H.S.
We've had it for nearly a year and added 5 yrs onto it. It's not the best, a hiss in the background, but my officemate said that that's probably due to the fact that we are using a regular phone rather than a VOIP phone. I haven't spent the money to see. But for a backup phone it works great. We were paying $25/mth to make 5-10 local phone calls - it wasn't worth it. We got faster internet (6 Mbps) and are fine. I am looking for a job and didn't want my cell phone number all over the internet, so it was a win-win. Yes, occasionally I lose a call, but I think that's only happened 3 times in the past 9 months. So, for the important calls (ie: interviews) I give them my cell number.
No service is as good as a land line - not VOIP or cell phones, it's just how it is. Decide money savings vs how good do you need the signal to be. We have a spare computer that we keep MJ running all of the time.