As one of a small number of Alt-Az imagers, using a refractor and DSLR, I'm often surprised that it hasn't gained more traction in the imaging field. It offers an easy entry into the world of imaging with minimal investment, allowing the user to concentrate on and develop the pertinent aspects of imaging and processing, without simultaneously having to worry about polar alignment and guiding. Apart from which, it can still produce more than adequate images, often comparable to those with more sophisticated gear.
The biggest issue I find, though, is that the very nature of Alt-Az imaging does limit the amount of time that can be devoted to a single object. With the typical British weather imaging time is really at a premium, so I generally don't re-visit an object to gather more data, but move on to something else. The upshot is that most of my images are inherently noisy, not helped by using a DSLR rather than a purpose-built astro camera, and would probably be regarded as poor compared to the conventional imagers who might devote tens of hours to a single target. Such luxury!
On the other hand, I've found StarTools to be an invaluable aid to extracting the most out of an image. It's easy to get something out, but finessing to get the best achievable I find difficult and often appears clumsy. Any guidance on how best to treat these sorts of images would be helpful. As Nigel has indicated, it would be good to see how a StarTools expert processes a typical Alt-Az image.