Any one use an ergonomic kneeling chair?

[Handsnotwands]

I have hip pain / lower back pain / opposite side knee pain that I think is exacerbated by crossing my legs subconsciously all the time.

I wouldn’t be able to do that on a kneeling chair so think it may be my answer

Are there any drawbacks I should consider?

Think you would be better with a saddle chair. That would stop you crossing your legs, sit in a more neutral position and not put any pressure on your knees.
Also stand and move regularly and exercise and stretch.

that's v useful advice - thank you.

i do move as much as possible but every. single.. time. i don't think about it i cross my legs. i even tried having a cushion between them but it's not very practical