Yeah the very low degree ones need to take extremely light cuts generally. The thing to remember with them is that at dead centre it's effectively zero rpm so I use a very small stepover and DOC for plastics and wood.
Well, I'm using them like I'd use a regular spiral end mill cutting a dado - so using the sides, not the bottom. Ironically, using the bottom and "drilling down" seems to work best. Another interesting thing was that using the 1º taper bit on my CNC seems to work as a final clean-up pass (less than a mm of material to remove), but using it in my hand-held router is pretty much a no-go, except for drilling down. And what I'm dong there is clearing away most of the waste with a regular ¼" spiral cutter, then coming back with the tapered version. And, at 1º, it should be super-close to a standard 0º end mill, but the spiral on this bit is very steep. Maybe I already dulled the bit?
I'd be really surprised if you did, they aren't at all aggressive but they do last quite a long while even under heavy load. Mine on the CNC have lasted considerably longer that I ever expected and they are fairly cheap ones.
