Glind make some claims about the competition but only offer a 2year warrenty and helton offer a 5 year warrenty. There kit does look fancier but all that glitters....
Quote from Glind site has to be directed at helton
"Another competitor uses a full copper heat exchanger. This idea works well, however in the past the copper disc baffles required to ensure correct coolant flow, can rub on the outer housing and cause engine failure"