I bought 3 tiers of 7' scaffold at the local home store this summer to replace my upstairs windows before the derecho storm hit and did so much damage. It's been handy to have for house repair and tree work.
First issue is the planks are aluminum side rails with plywood in between. They aren't the least bit weather proof. The plywood started showing blisters within just a few days. Any varnish applied at the factory was totally insufficient. I took them apart and painted all sides twice and the top with traction sand mixed in for better grip. I have another 2x7 scaffold (estate sale find) with an all aluminum plank that is clearly weather proof. Older but much higher quality. It has ridges and is coated with plaster from previous owners so it's not the least bit slippery. The aluminum plank has far less flex as well. I'd buy all aluminum planks (even at 2x the price) but none of the home stores have all aluminum planks in 7' lengths.
I have 4 wheels and 4 leveling screws. Use depends on the location. The wheels are great for moving around which I did a lot this fall.
First time I set up the 3 tiers, it was very wobbly. I guess that's the difference between home store grade (Menards, Northern Tool, etc) and commercial grade. Using 1 or 2 tiers, the wobble isn't noticeable. The third really reveals the wobble. I would say 3 tiers is the max height for the home owner grade. The pins and cross brace clips are all a bit loose and that contributes to the wobble. bolting everything together would firm it up but that would be rather time consuming for set up and tear down.
$1100 spent on the 3 tiers and 3 planks, level screws and wheels. I figure that's a bargain as I can surely sell it for nearly that much when I'm done with it. Local scaffold listings on craigslist, fbm, etc are rare and what does appear, sells pdq.
Even at $1k, I'm already ahead by being able to do repair work myself instead of hiring it done.
There are just some tasks you can't do on a ladder.
the standard home edition end frames won't fit in a mini van. Had to recruit a friend with a pickup truck to get those home.
I usually use a step ladder to get up and down. I strap the ladder to the scaffold so it is more stable. Beats climbing every time.