I can't add anything to your post except that I agree, two thumbs up for a great review.
One suggestion I've already sent CallVantage is regarding more help with the dial plan. Heck I even had to go out and look at it to remember how to get to 7 and 10 digit dialing and I architect large VoIP systems for a living! There's no reason they can't add it to their site, in fact having it raises Bing and Google hits which could drive new traffic to their site for conversion to their offering.
I just joined DSLReports, so will add my review and will also add in my tweaking hints for a Linksys SPA2102 gateway.
Above is the dial plan for 10 digit dialing. No need to dial the leading 1.... I live in an area with multiple area codes, so I always have to use 10 digits.
The above dial plan is what I use today. It includes the 10 digit dialing and for speed dial, you just enter #XX. To tell the system you are done, just enter #XX#. Extremely fast.
Did you confirm that your post rendered 100% correct? I noticed after you posted that my original post wasn't due to use of syntax that the forum thought was HTML tags. My use of the angle brackets or less/greater than signs was removing some of the needed sting code.