The summit cam is as reliable as all the others. I can speak first hand and for others.
Yes they are cheaper, and SScamino is right in the fact that they are produced by Edelbrock. I ran mine for 5 years straight with 100,000 miles, pushed the motor to 8000rpm with no issues from that camshaft, no wiped lobes, and hardly any wear at all. Hell you can talk to some of the guys over on Moparts who run summit cams in their 383's and 440's and turn low 12's in the quarter. A lot of guys on moparts endorce summit cams more than comp cams. Comp Cams quality has gone to sh*t lately as they started importing their cores from overseas. I talked to both techs at Lunati and Comp Cams. Comp admitted to having a lot of returned cams with wiped lobes resulting from break-in and occurring right at 1000 miles. Lunati on the other hand acquires their cores here in the U.S. and they were designed by Harold Brookshire who designed the XE line for Comp and left them to design the much better Voodoo cams for Lunati. You can contact him over in the TeamChevelle forum under the name "UDHarold" and he is very nice to discuss the proper cam you're looking for.
Lets leave the whole "It was probably made somewhere else" topic for another post and lets have those who have actually used summit cams put in their own input.