I have used both QNC and EN. I really notice the EN speed when I use the 7135 as a modem for my notebook. It works great and sure beats trying to connect through hotel phones or even hotel ethernet lines. Otherwise, the speed difference is not that noticeable. E-mail downloads faster with EN, but not fast enough that I would spend extra for it. As far as I can tell, it makes some difference with Web browsing on the 7135, but browsing is still slow.

I use the National Single Rate plan and EN comes off of my minutes. For casual use of the browser and regular e-mail downloads, QNC should be fine.