Agree with what KennyG & others have said... We have had a Cyclone Rake XL for at least 10yrs.... We have run ours behind two different zero-turn's & after owning it, I would not be without it. It is easy to connect & disconnect & breaks down easily for off season storage. Very little clogging issues, maybe once a season & usually caused by a stick... but again rare occurrence. Ours does run the 8" Diameter tube & a 9hp engine. We have 30' (I think) of additional pickup hose & as others said it will pickup rocks. We use it on part of the driveway, gardens, & culverts; I just throttle down the engine to create the correct amount of suction for the task with out pulling the majority of the rock off the ground.
Also their customer service & support has been outstanding, when we needed to swap the XL to the new mower they were super responsive & it was not crazy money.