I have a Trac Vac model 854 pto leaf vac. The vac is a 3-point mount and blows leaves into a trailer that's attached to it. They make a variety of adapters to attach it to mid-mount mowers and collect the output of the mower deck. I use it with a 20-foot hose and handle instead because I'm collecting from a rock-lined ditch rather than a mowable lawn.
It's pretty well built and has given me no trouble over the years I've owned it.
Cyclone Rake easily attaches to a 3 point hitch. They sell a 3 point adapter and it's very easy to fabricate one. However, I think the original question may have been to find a PTO driven vacuum, which I don't believe CR makes.
FOOZLE, take a look at the LAWN GENIE I have listed on the ATTACHMENTS FOR SALE page. It is a "never leave the seat" collector and may be what your looking for. PM me if you have any questions.