I personaly think that you would be able to tell by the gurantee that a company gives on its products how good it is. If you have that much faith in your product you will give a minumum of a years gurantee on it, any less then that will give you the answer and if a company starts to try to explain why it does,nt give a years gurantee will tell you straight away that they have no faith in there product. No idea what the gurantee is on the Mark T infinity is just price puts me off