I think they are all the same crapo quality. Had good look around at Dubfreeze today and every traders ones seemed to be the same with the exception of an auto jumbler who had a Veng one which seemed slightly better. I have one of these and it may be up for sale if I don't use it when doing my sliding door. Door is luckily v good so hopefully won't need it - should know in about 4 weeks. Give me a shout if you are still needing one then.
Andy