Think about your priorities. My internet service comes with a "free" analog phone line with unlimited US calling, so I added an ObiLine to my existing Obi202. Since I also have E911 included with one ITSP and two cell phones, I'm not too worried about the ObiLine's reliability - and strongly prefer the 202's additional features over the 110's.
So far ObiLine has been OK, with occasional echoing.
Note: "free" = $11/month in additional taxes, but it's still a better deal for me than AT&T or Comcast, and I get to support a local business with good customer service.