I use a $20 Harbor Freight and a $800 Woodrat. Both excellent jigs to help me accomplish what I'm attempting at the time.
I also have a $100 dovetail saw and some very good chisels for when my eyes were good enough for handcuts. I've won a Leigh and a PC jig from magazine tips, that I later sold. They were excellent jigs as well. Bottom line is; No jig will do the job for you. You have to understand the geometry involved before you can be happy with any jig. Best way to learn that is to cut some by hand on scrap pine. Doesn't matter what they look like, but you will learn more about what you want and what to expect from a jig. Before anyone tells you otherwise, here's samples from each of the above jigs plus one handcut. I'll let you guess which is which.