I like lock ons! After sliding down a tree to the ground (thank god no serious injuries) you can take them climbers and put them where the sun don't shine.
That said I use the cheap Dicks ladders and mostly any safe sturdy stand I don't spend a lot of money on them as I use 15-20 throughout the year. I set them up early in the year (Sept. for Oct) and I always keep two for a new set up I find. and then I'm taking some down and puting them up all season. I made some back pack straps,strap the ladder sections and the stand together and back pack them in the woods. no problem. Nothing like the secure safe feeling of a lock on stand. But always wear your safty belt. Mike