Pre-set trees is definitely the way to go if you can get away with it, although it is arguably a fair amount of work but pays off when your season gets going. The last two seasons I have prepped trees in the spring and throughout summer and have been rewarded by having to only carry minimal gear in with me. It is a huge PIA to have to carry in climbing sticks, a bow, pack, saddle, etc. each and every hunt. Often would end up sweaty before I even got to my tree this way. Now I just carry in my bow and saddle and, if needed, a small(er) pack. I mostly hunt private land.
I buy the ameristeps in post season when they are on sale for a buck or two each. I'll buy about $100 worth. Last year I got two boxes of the 'step up' (smaller) screw ins and a box of the grizzly steps (bigger). I use the smaller step ups for my 'ladder' up the tree and the grizzly steps as my platform.
I did see the gorilla grizzly steps at Dunhams (sporting goods store) here this year so bought a couple packs of them as the deal they had they worked out to about $2 per step. These have a better thread for self-tapping on the step, but as with all of my pre-sets when I set them up I take an compact dewalt drill with a 3/8" bit and a rubber mallet. It takes me about an hour to get a tree drilled and upto hunting height and usually another hour or more to finish cutting shooting lanes, install pull rope, accessory hooks, etc. Probably takes me about 2.5-3 hrs on average to fully prep a tree and location. Would definitely take less time if I had a buddy to help. Oh well...