I do only Sigma! From time to time I tried some other computers for some other bikes and repeatedly went back humbled to Sigma. Their wired offering is shrinking, but if you are in EU or have some shipping address there, it is not all lost. You go to the spare parts on their website and they have old models there sold as spare parts on the cheap. Unfortunately, in my memory, they only ship to EU. I ordered a bunch of them and hopefully will get unified with them at some point in the next year.