I'm a new user and just wanted to share my experience with Packetel's fax-to-email service since I haven't found many reviews out there.
I needed a cheap, easy way to receive an occasional fax via email. I have an old fax machine for sending faxes from home, but I wanted to be able to view my faxes from my webmail whether I was at work, home, or traveling. I signed up for eFax's free service several years ago and found it fairly reliable, but over the past year or so I noticed that it was taking forever for faxes to arrive in my email inbox. The service worked OK til then, except I was having trouble receiving faxes from certain all-in-one fax/printer/scanner/copier models (specifically HP Officejet 5510s). Often times the attachment would show up as an unreadable, corrupted 1-2K .efx file in my email and I'd have to ask the sender to re-fax several times. Because of this, I got several stern emails from eFax telling me my account was suspended because I went over my 20 fax/month limit.
Though I wanted to keep my efax number, I didn't want to pay their ~$13/mo fee for unreliable service. That's when I found out about Packetel's unlimited receive-only service via this forum on a google search, and decided it was worth a try since I only had to prepay for 3 months at $4/mo by credit card. The number isn't local to me (it's a CA number and I'm in NE), but that isn't an issue since most of my callers are elsewhere anyway.
I've only been using Packetel's service for about a week, but so far I am completely impressed at how well it works. Each time I have received a fax, it shows up instantly in my email; I just sent myself a fax, and it took approximately two seconds between the time my fax machine disconnected and the time the Packetel email showed up in my inbox (you can input two email addresses to which the attachments will be sent). I now have absolutely no trouble viewing attachments, regardless of the model of the sending machine.
I am not affiliated in any way with Packetel other than being a customer. They do have a refer-a-friend program, so if you're thinking about signing up for a cheap bare-bones receive-only fax service, and you don't mind the limited selection of area codes, send me an email and we each get a free month of service. My only concern is the stability of the company; I don't know anything about them and I would hate to give my number out and then have them disappear!