I have one that is 3 seasons old and one that is 2 seasons. They have been good, trouble-free units for the most part. I have knocked them off the stick many times, ran them over in the mud and left them in the rain for weeks. The only issue I've had is a broken tab on the battery holder. I took it apart and glued it with some epoxy. 60hrs later, it's still ticking. Batteries seem to last forever.
I like the different grade options. The magnets are strong but should be on 1/4"+ material for a good hold. They are reasonably cheap for what you get. I've also used on my dozer blade to cut grades. The only issue I've had is on the older one. If I have the laser within 20' or so and the receiver is pointed directly at it (reading in the center of the bar) it has a hard time picking up the beam. Not a big deal once I knew what was happening. I set up accordingly.
I purchased a LR60 late this fall for my ditch work but I'll always have a CR600 in my truck for a back-up.
As long as you understand the geometry and issues that can arise with a stick mounted receiver, you'll be fine with a 600. I'd consider mounting it to your bucket.
