I have never had a problem with any kind of hip, knee, or ankle pain due to stress from toe ties. I had a good enough amount of slack in them that I was able to get my blades to the ice without strain and I have always been fairly flexible. The obvious drawback to having that slack in the toe ties was the pad not being securely strapped to my feet thus causing them to be "sloppy". They are all over the place if you know what I mean. Currently in Vaughn V6 2000 pads, I strap the knee lock and calf lock pretty snug. I strap both of my calf straps moderately, neither tight nor loose. I think the 6th hole from the inside end of each strap leaving 5 open holes before the buckle. I used to strap my bootstrap on the 3rd hole leaving 2 holes of slack, again, not tight nor loose.
Since I started using the Pro Laces the play of the pads have increased so much. The pads are now kept tight to the skate and I still have the same, if not more, ability to get my blades to the ice. On top of that, all of the sloppiness has been removed from the pad. They're either firmly in place or return right back firmly in place once I am off my knees again. The other positive is I have been able to remove the boot strap all together. This gives my feet that much more flexibility in getting my blades to the ice in the butterfly and also saves me a few seconds getting dressed/undressed. I am not exaggerating when I say these things have been right up there with the swap to One80 cowlings and step steel as far as improving my push game when down in the butterfly.
I will agree with bunny that the one negative I have found with Pro Laces is the need for the extra attachment piece and the screws, more so the screws. I have noticed 2 of them, one of each foot, back about halfway out from the t-nut throughout gameplay. Thankfully they haven't backed out all the way. Loctite should fix this, I just keep forgetting to get some to apply to the screws. I just make sure I always check them and screw them back in before putting my pads on.
I think this product would be pretty flawless if it was sold in a toe bridge. Obviously that would drive the cost up though. I am contemplating making my own in a spare set of toe bridges that I have or just sending my spares to him for use in a new set. Option one being cheaper, option 2 better quality as I have no idea how to use a sewing machine, nor do I have one haha. Either way my current set will be for sale eventually.