I've just hacked away merrily at the rampant forsythia in our garden. It produced a large mound of waste, as did the laurel I also trimmed and various other clippings. In an hour and a half, I reduced the lot to five 40L trugs of chippings that I added to the compost bin and the green waste collection bin. I also poured some straight onto the garden as a mulch.
My Alko shredder coped well without one snarl up. It managed branches up to about 15mm thick through the dedicated branch feeder and could probably have done thicker, but I erred on the side of caution. I got it for about £40 on eBay three years or so ago, but spent another £30 having the blades professionally sharpened
Forsythias produce long, spindly branches and these were fiddly to feed into the shredder, so after the first 45 minutes I spent shredding on Sunday I spent some time cutting up the bits into manageable lengths. This really helped when I did the second lot last night before the rain.
I use mine a couple of times a year, but it's good to know I can reduce waste down very substantially whenever I need to.