The Esta system is great if you already have a machine that has the old knives that sit on springs and you are going mad trying to set them up like I was, but if starting from new then you simply avoid that type of machine and buy one with the Tersa knives which is exactly what I would have done had I known the issues I was going to get. The added cost of the Esta system is not a cheap option and although gets you out of a jam it is still not the Tersa system.or could get the ESTA Bruck stuff from AMS and S&S spectric mentioned in another thread if I do get fed up and want to make the swap.