I have to say that for the price that I can get any LARGE BRAND NAME OIL on sale/rebate or discontinued from a store shelf, I will stay with the brand name oils.
Although, I am on the boat with those who like the PEAK OIL. I first got the PEAK 5W30, 30 qts/6 ProLine Filters (FAR) when it was first introduced at PebBoys.
When my daughter just got her '06 Mazda3(3 yrs old in '09) w/50K miles and I wanted to do some low 3K mile OCI's as we didn't really know the maintenance history so, I used the PEAK.
I(dad) wanted to be satisfied before going to 5K mile OCI's. From a "seat of the pants" feel & sound of the engine, I really like the PEAK for 5K mile OCI's. I like it better than the HavolineDS(20+ qt stash) I am currently using(I've been a Havoline Fan for years).
I also have a stash(20 qts) of Quaker State Conventional waiting in the wings. All 3 oils(Peak, HavDS, Quaker State Conventional) show to be very good in the PQIA testing. Will be using all of these oils in all of our vehicles.
I love looking for oils that are being discontinued, for their low price on a good product.
Often when an oil is being discontinued, it often means that the store that I frequent is only making shelf space for something else, not that the oil itself isn't being marketed any longer. Often this is the case!