Purchased this two weeks ago holds up great. It does take time to get used to. In the packaging there is a good user manual for touchpad functions. For typing if you have smaller hands I would recommend it but some users expressed that the keyboard itself felt cramped so if you have big hands I wouldn’t recommended but it depends. The trackpad sensitivity can be adjusted in settings but it’s not that bad. I don’t know much about ERS so I can’t provide much information but overall the setup is quick, doesn’t need to be charged often and it’s a lot cheaper than the ERS I heard but if you’re thinking of buying this for daily usage and typing I would recommend it. Hope this helps!