nils hand auger
The downsides i can see are the cutting heads can rust and they are pretty touchy if you drill into something or bang it on the ice. I put my spare head on late in the season last year because the ice was getting so thick i wanted a sharp head to save some wear and tear on my drill. Even through 3ft of ice i could hold my drill w/ one hand and let the auger bore right through effortlessly. Problem is after about 12 holes w/ my brand new cutting head i drilled into a submerged stump and it wouldn't' cut a lick after that, just sit and spin on the ice. After seeing that a backup cutting head is a must. As far as the rust goes, dry it off after use and wipe a little oil on it, otherwise the next time you take it out it will have some rust started and it makes a difference in how easy it cuts.