I've just recently begun my foray into semi-serious auto detailing with the purchase of a black sapphire metallic 335xi. (My last car was white.) I first picked up a few cheap microfiber towels from Target, and I've since bought several different microfiber products from AG.
The cheapies have more lint and it is pretty obvious that they will not last as long as the Cobras, but they still work better than a t-shirt or terry cloth. I've relegated the cheapies to the dirtier work, like door sills, wheels, etc. That way, I save the Cobras a bit.
Of the Cobras, I've been using the HD Guzzler for drying and prefer it to a chamois, though it's not the drying miracle I hoped it would be. It needs to be about twice as big. I use Cobra Miracle Towels for buffing the last of the water (fluffy side) and applying the QD (short side). These work very well for these tasks. I highly recommend the Indigo Edgeless cloths for removing polishes, sealants, and waxes--clearly superior to the other types I've tried for that task. And, the glass waffle-weave towels are nice for glass. I don't put anything on them when cleaning the inside of my windows. It's not marketed this way, but the waffle-weave helps with grip when the towel tends to grab the clean glass. I also grabbed a six-pack of Cobra multi-purpose towels (white with red edge) and use them here and there as needed.
Overall, I'd say the prices I've paid for the Cobras are in line with the apparent quality differences vis-a-vis the cheapies. The cheapies are not worthless, though, and I'm glad to have a few of them around.
EG