The Durametric is great, if you can get it to work. It took me 3 months of back and forth with them to finally get a cable that would work on my '99.
Then there are the laptop issues. If the specs aren't up to par, or if the laptop is too new, you can have trouble with the cable and program running right.
The Durametric is huge PITA.
You might look into the Autel...looks good from what I've seen and it is self contained (no laptop required). It has some advanced functions, but I'm not 100% sure how it's abilities stack up next to the Durametric.