I hope you have better luck with OOMA than I have had with Clear. In fact, I was thinking about switching to OOMA for voice communications.
Clear Internet service is fine. It's reliable and fast. Occasionally during the middle of the night it'll shut down for an hour or two but I have only seen this a few times in the past year.
The voice part is terrible. It works fine except during the hours of 6-9am and 3-7pm. Then you get lots of cut outs, dropped calls, static, etc. It makes using the phone almost unbearable. Of course when you call Clear or visit one of their stores they always tell you that you are the only one experiencing this problem. Nobody else has reported it. When you do call their tech support line you ALWAYS have to give them the make/model of your modem, the serial numbers, the date the product was installed, your account number, your full address, etc. You are on the phone with them for at least 15 minutes before you are even allowed to say you have a problem! It's aggravating.
But I get both Clear Internet & voice for $55.00 per month, and all I am paying on top of that is sales tax. No other kinds of taxes, surcharges, etc. If I used AT&T for my phone and internet the fee would be $118.00 per month. So I am happy about that.
How much did you have to lay out to get your OOMA up & running?