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Everything, excellent control, no carpal tunnel problems. My wifew and I have been using them for 20 + years and love them. We even have them for our laptops -they are that comfortable to use.
none at all. easy to clean, turn over pop out ball clean out lint from 3 small rollers, pop ball back in; good to go for another 6 months. These things last for years, once you get used to them, you will throw rocks at all types of mouse!
Buy at least 2, they can be hard to locate when you finally need to replace one, few if any retailers have them any longer!
I've been dealiing with SuperBiiz a long while now. The selection of products is outstanding, the prices are incredible and the customer support and service is phenomenal!
I continue to use SuperBi... (more)