I have a celestron 44306. It's used to look for RPM's (repunched mintmarks). I also used it for taking pictures for close-ups of my WAM (Wide A M) discoveries. The only drawback is that I can't get the whole coin for a clear picture. As I zoom out the scope gets out of focus. I have also used it for a couple of slick coins that I had. With my loupe, I thought I had a 1914-D penny. But under the scope, the '4' was an '8'. Don't ask me how they could look like each other.
You get what you pay for. Mine was like $70 shipped on Amazon. Found it cheaper than ebay.
I have heard lots of good things about the dino-lite. It's more expensive...but better. It will save your eyes...but on being faster? Just depends what you want to do with it. It great for looking for errors. I did find a cool die break. I'll edit this with a pic or two in a bit....sorry lunch.
Here's a close up of the WAM. BIG gap between the A and the M.
And this was about as far as I could zoom out on this penny and it still be clear and focused.
This one I saw some distortion above the letters and needed a closer look.
And this last one has the die break but I'm having problems getting the whole pic to show. The break goes from the rim into the lower right corner of the memorial building. It may look like a hair. I hear it's fairly common. Sometimes there will be a break from all '4' corners of the building. This is the only one I've found so far.