I have a l3200 with the b77 backhoe. This has the manual thumb. This has a separate operators seat.
One person can position the tractor while the other person operates the backhoe. We use ours for moving sticks of timber and digging stumps.
This don't have the "ripping" power of a larger excavator.
I know it's kind of pricey. about $7,500 and $400 more for the thumb unit.
We have used this attachment has been used more than any other attachment.
Hope this helps. Have a great day !