I just posted this same info in the JD forum to a similar question, but it appears to a different audience. I have a TracVac 880. I am perfectly happy with the results I get. But, I'll be the first to admit I do not get 100% clean up. Part of the problem is the combination of leaf leak out the front of the deck and exhaust routing on the JD x728 blowing leaves out of the path of the deck. The bigger issue is leaves never quite all fall, so there is a perpetual, though decreasing replenishment of the leaves on the lawn.
As mentioned by a few, the TracVac does not collapse, nor fold up. It takes a significant chunk of storage space. The best I can offer there is, I store stuff inside it over the winter, like a trimming mower and a wheelbarrow. Not optimal.
I made this youtube video of my set up working the leaves: http://youtu.be/njiJli4PpXI
Here is a little time-lapse from that same day:
Half Finished: (note the leaves left behind)
Finished, at least for a day, you can see a few trees still clinging to some leaves, and my entire lawn is surrounded on all four sides by second generation PA hardwood. There is no such thing as the "end of leaf clean-up"
Disclaimer - These pictures and video are from last year.