I bought an Ooma off woot wayyyy back on 3/26/11. Here's the discussion http://www.woot.com/Forums/ViewPost.aspx?PostID=4400975
With additional searching you can find plenty of information.
The bottom line with Ooma is that you have to pay for the box up front, and make back the price you pay up front with the basic plan's only-pay-taxes over time. It takes (depending on your current phone bill) anywhere from 3-12 months to 'break even'.
But regardless, here's my take on the good and bad after 1.5 years with it:
- The monthly price! It's about $3.50/mo for me for unlimited local and long distance service. Ridiculous.
- I can fax with my all in one printer after getting a phone cord splitter. This has been incredibly useful repeatedly, and the $1.25 a page you save over a trip to the UPS store or FedEx adds up RAPIDLY. Plus you don't have to drive out, etc.
- It's incredibly obvious if you put the box in a visible spot when you have internet and when you don't. The ooma "flower" glows blue when it's connected, and flashes red when it can't. I learn more about comcast outages from that than my cable mode.
- Integration with Google Voice. I happen to have a callbox in my apartment that calls my ooma. If I'm not at home, it goes to my cell phone. I can let in the UPS/FedEx guy from my desk at work (or wherever), and receive calls from home at work.
- You can take the box with you if you go on vacation (and you have usable internet). I've actually done this, and yes it works. Yes, it's pretty cool to have a working (FREE) landline. Note that this is not completely kosher as the 911 info you've input is now inaccurate.
- Call quality has been completely fine, and has generally been better than previous landline service. It's significantly better than my cell phone call quality.
- Free local and long distance in the US, and competitive rates for international calling.
- The 'upsell' (Ooma Premium) does have some nice features, like an instant second line (!!), active telemarketing blocker (useful in conjunction with National DNC list), whitelisting / blacklisting capabilities, and more. You can find the full list here: http://www.ooma.com/premier/features. It's $10/mo. You get 90 days free with your Ooma setup.
- Sometimes when I hang up and need to immediately make another call, the phone won't have hung up, and will complain about the fact that I can't use a second line without Ooma premier. Then the phone will ring back with the call it thought I 'dropped'. Hanging up again remedies this. A minor annoyance, but notable as it happens a few times a month.
- It took me 2 different phone-line splitters before I got one that worked with my phone / all-in-one printer. I don't know why.
- Ooma service outages. Rare (I've only had one service outage I've noticed that was more than 1 hour), but obviously if it happens it is a massive inconvenience.
- Losing the ability to have a working phone during power outages. Don't forget the fact that converting to a VOIP box means that unless your internet connection and VOIP box (and router, potentially) are ALL on a battery backup, you will lose the ability to make calls when the power goes out. Apt in this time of Sandy-induced power outages.
Overall: The good FAR outweighs the bad. So much so that I've bought 2 as gifts for people, who have loved it as much as I have. Moreso for one family who saved over $50/mo after the switch.
edit: Forgot to include the tax calculator, where, once you input your Zip Code, you can see exactly how much the 'basic' service will cost you per month: https://go.ooma.com/tax_calculator.