It has worked for me on two occasions
Once I traded a one bedroom summer beach week for a 2 bedroom Orange Lake in May. I told the other owner that this was an uneven exchange (I was getting the better deal I thought) but she said she just wanted the beach and was sorta tired of going to Orange Lake 'all the time'. So we swapped. I sent her an authorization letter for my place and she did the same for me.
The second trade for was two weeks in my year-round place for 2 'future' weeks (not necessarily together) in the other owners' year-round places. I agreed not to ask for 'high demand time' as she was not using 'high demand' in my place. So far I've cashed in one of the two weeks and it's a great story.
I really wanted to go to Ocean City, MD where this owner had two different one bedroom units. The 'problem' was I wanted to go when the Pony Swim was going on in Chincoteague, VA (about an hour away). That's in July - PRIME TIME! I asked her to keep me posted if she happened to have a cancellation for that particular time and didn't think she'd get a renter. She responded back that, if I didn't mind not having any furniture, she'd let me use her THREE bedroom, 3 bath penthouse unit at a brand new place she recently bought. It had a fabulous kitchen but no furniture to speak of. I said, 'well, okay, if I have too.' (grinning) Boy, was I pumped. The place was fabulous. She had managed to get some mattresses in two of the bedrooms and had a TV plus some chairs. Had kitchen stuff so that was okay. The location was terrific, the place had an indoor pool (what a great room with wonderful, comfortable lounge chairs) and a rooftop outdoor pool. Rooms were immense with high ceilings and bathrooms were richly tiled and oversized. I missed the dining room table (which surprised me).
We got to see the ponies swim. We got to see the pony auction. It was great! If you've every read or heard of 'Misty of Chincoteague' you know what I'm talking about.
I still have a week coming and I know the two of us will work out something that will please both of us. But if it doesn't work out that I get another week - it will be my fault for not following up because this person I am working with has been great through the whole thing. She used my place more than 2 years ago. She's been telling me about 'prime time' weeks that are available to me (even though she doesn't have to) if I want to use them. I just haven't been able to go when she's got availability.
I can't say every deal will be like this but I've been pleased.