I have had a NextEngine for years, and I like it. The support is second to none - it is online based, and they usually get back to you within a couple hours. Support runs within the software, and you can easily attach screenshots or the model as needed.
I think the issue is the "what next" problem. I can scan whatever I want, but... What next. It is quite difficult to go from scan to solid model. Tools within SolidWorks are not enough to use the detail of the scan for a good model. I have finally been able to spring for the RapidWorks addon from NextEngine which is supposed to make reverse engineering from the scan data much better and easier. Unfortunately I have been short on time since I got it, so I haven't gone far up the learning curve yet.
If you have any specific questions, feel free to post them, and I would be happy to answer. Again, I am very happy with the price, speed, and detail from the scanner. To date I use it mostly to print directly from scan to a Dimension FDM printer.