I looked into getting a crusher bucket and whilst I love the idea and the theory of saving loads out and back in - it just doesn't add up for me. I have been told from several people who run them (albeit on bigger machines) that a crusher bucket will crush about what the machine weighs an hour. So for me, 3t. This can slow down or speed up depending on the type and size of gear being crushed but a rough average of 3t for 3t machine.
In theory on the average driveway dig, I might take , maybe 2 loads out of old drive and soil for reduce dig and bring back in 1 load of crush/ type 1 as sub base. At 16t this would take me 5 1/2 hours solid crushing. By the time you've had a phone call or two from the engcon rep

, cigarette, tea, piss, whatever takes your fancy that's at least 6 hours so a good majority of the day. At £300/day that's cost about £230 for you to crush. Which is pretty much what it would cost to buy it in. So you've saved on the cost of mucking it away in theory! Although the hardcore element of the dig might not make up 1 of the two loads?? But lets work on that assumption.
The downsides from what I could see are you've got to have somewhere to heap and store the pile before and after crushing. The buckets cost £12ish grand if I remember correctly for a 3t machine so you've got to save a fair few loads to pay that back plus its maintenance, teeth, jaws etc. Its another thing to get stolen/ insure so your overheads increase and its heavy so wont go on trailer with a 2.7t digger.
Just didnt seem worth it to me on the smaller scale. I get why the bigger guys run them, they can process 20t in an hour and that would probably pay even with the increased cost of purchase for a bigger bucket. Better to leave the guys who spend millions on their screeners and crushers to do the work for you.