From the few times I have tried the ASI120MM on the home made finder guider, I have found the camera very sensitive. Not too sure about its limiting mag through the guider but it looks to be good.I find it goes well on wide field images of the sky also. The 150 deg lens included does a great job.
My camera did come with a few dust motes that I am in the process of locating/removing.
But as I have never tried any other cameras, my opinion is of course biased
Good luck in deciding and congrats on pulling the pin on one
