Yearone heater core...

74' 318 swinger w A/C
http://www.yearone.com/serverfiles/fbshopmain2.asp?input=heater+core&SM=1&SC=1

anyone use these? any problems? recommend a different one?
to me, it's worth spending a few extra bucks over e-bay on a known good quality core, considering i shouldn't need to do this again for ~ 20 yrs


thanks,
chuck