Chirp does make things a little clearer. Kinda like reg tv v HD tv. Do your research and decide what units interest you. Don't be afraid to look for refurbished units either. These are usually sent back to the factory for some flaw and sent to a team of specialists for repairs. I have purchased many refurbished items and every one of them worked great. It can save you money and allow you to upgrade from what your original budget allowed.