I have heard numerous complaints about the LP's knobs, calling them loose and wobbly. I have experience with only one LP (mine) but the knobs feel fine on mine. I certainly would not call them loose. They do wobble a bit if you apply some sideways pressure to them, but I have never found the small amount of wobble alarming. I think it has to do with the kind of pots people are used to tweaking. The knobs certainly do not feel anything like the knobs on a Mini Model D, but they feel similar to other synths of today.
It is difficult to tell if the "loose and wobbly" knobs that people talk about is something that is in varying degrees on different LP's, or whether it is just dependant on what the individual user is used to feeling.
The knobs that I am referring to are the knobs on the tuning function and the one that changes the presets. The larger knobs in the different function sections feel just great to me.
I, for one, am happy with the knobs on my LP (and everything else, for that matter).