It works alright for therapeutic purposes, unless you are very advanced, then I don't think the resistance is strong enough. It is not really a strength builder. There are much better devices for that. But $18.00 for something that may have a bucks worth of material? That is disappointing. I could live with the short durability if the replacement cost wasn't so sky high!

I have multiple pairs of base layers. These are all around the best (lightweight) bottoms, in regards to functionality. If you want pure comfort, 100% Merino has the leg up. But since I, like most of you, am an active person, these are perfection. The three different materials provide exactly what is needed, where it is needed. And thanks to the sewn in Silver, you can take them off after a day of ice-climbing and not gag because of your stank!
They don't make them better than these!

It is not a bad pack for the money and the weight. It isn't very comfortable due to its very lightweight internal frame which only consists of a couple aluminum rods. Shoulder straps are very comfortable though. Sweat buildup is not bad for a pack with pads instead of a mesh. Dividers inside are nicely arranged. The hydration pocket includes a Velcro strap, not a loop, making it ideal for platypus, a PITA though for Camelbak and others that need to be hooked.
The biggest issue is the size. I have a torso length of about 21 inches, average if you ask me for a male. This causes the waist belt to sit at my belly button. If that's your thing, you'll like this ultralight. Otherwise it'll drive you nuts, the way it did me. I am selling mine after using it once!

Yeah, it works fine, but no better than any other brand. And they all supply theirs free with their reservoir. Save your money. Just buy Platypus or MSR to begin with!

These boots fit a little small, so get them a little bigger, maybe half or full size. Toe box is quite roomy for average size feet. Heel grip is pretty good, which is why I got them, I have a narrow heel.
Here are my gripes: The tying system automatically pulls up the toe box as you are walking, no matter how you tie them, severely decreasing toe space. Ankle hold is marginal at best and the tread is very slippery. They are surprisingly waterproof though.
That is why I recommend them for walking flat trails or everyday wear. If you are hiking uphill or anywhere where it is rocky or wet, try something else, maybe Scarpa, Meindl or Lowa.