The advantages are really personal preference. I didn't like the thought of having to buy a set for each gun or bother with attaching and reattaching.
The areas that I hunt you are not for sure where they are going to decide to show up and moving this set up in tight cover is easier than an attached bipods, which will get caught up in the briars if that is where you have to sit.
These are light weight, easily and quickly adjustable, can be used to swat at your buddy, cross electric fences, back scratchers, and they are not that expensive, if you are in the habit of forgeting things.
My buddy has a set of the fold up style, they cost him a dog as they got stuck in the mud, as he moved they came apart, cuss cuss wasn't pretty.
These are easy to make, if you want to take the time.
I use fiberglass rod and fuel line, put a couple of splits in the fuel line and slide in the rods,a little camo paint and your ready. I sand/scuff the rods so the paint will stay longer.
If you don't want to spend the time, give me a holler, $20. a set or $30 a pair, plus shipping.
later pup