I too have the home depot version.... not sure if it is an apple to apples comparison with regards to quality but it seems functionally equivalent. The one I have extends to ~10'. I would not call it wobbly as I never feel that it is going to tip over from side to side, but it does feel a bit "spongy" (at the hinges, enough to make me check for the 27345th time that the hinge pins are fully engaged) when extended.
I have a 28' fiberglass extension with levelers,..... a beast to move about (mostly because of the added weight of the levelers). I rarely use this ladder as i do mostly interior work if I can help it.
I have found the LG type ladder to be worth every penny paid. Like anything 'multipurpose' is is not the best thing for all things. One thing for sure it is best for getting:
a 10' ladder inside an 8' truck.
getting two plank horses inside the same truck.
getting the perfect ladder for stair work inside the same truck.
and doing the above
all at the same time in a single footprint
My truck has a 'roll-out' which has a 4'x8' is footprint inside the bed. When the ladder is 'stored for travel', it is small enough to sit aside of the roll-out and out of the way as to not interfere. Sometimes it will reside there for months on end before it is used again but it ALWAYS travels with me.
I do however wish I had gotten a taller one