Motorola S9-HD Bluetooth Stereo Headset - Sweat?

I'm in the market looking for a bluetooth headset and these seem to be the ones ive been eyeballing.

I've been searching all over the net for reviews and keep coming up with the same thing.. sweating eventually will mess these up.

I will mainly be using these at the gym for lifting weights and doing cardio. Yes, I sweat a lot. These are supposedly "sweat-proof" but from the reviews I've been seeing.. doesn't seem to live up to its promises.

Anyone here use these at the gym and actually produce a lot of sweat? How are they holding up for you?

I was originally gonna buy these online since they are a lot cheaper vs in a store.. but from reading about the constant returns and exchanges.. I might just have to pay a bit more and pick these up at BestBuy.. that way I can exchange or return the thing if they do mess up due to sweat.

Thanks in advance to anyone that can help me out!

I use them at the gym 4 or 5 days a week and they are fantastic, when they work. Your concerns are valid. I also sweat a lot when I work out. I find that after two or three months of usage something usually stops working with them. The microphone is usually the first thing to stop working. I've also had trouble with the volume buttons failing and one pair just stopped working all together. I've gone through at least five pairs. I just bought another pair from RadioShack and purchased their 2-year replacement plan. So if you do decide to buy them, I'd highly suggest spendiing the extra money for a replacement plan. If they didn't break all the time they'd be great.