We purchased the boulder grab when it first came out, and we have been using it for about 9 months now. I think there are a few things to remember when purchasing this product is "boulders" are irregular and each one is different. With that being said you need to adjust the clamp appropriately to get the max use out of it. While this is sometimes slower making adjustments on the pins for my guys, it has saved a many backs and is much safer. Also its worth noting that while it may take a bit to make the adjustments straps take just as long to rig, and sling a boulder if not longer to release it.
Personally as we have used this product over the last year we do like it a lot but believe the real value is in safety. Its efficient tool once you are able to fine tune the adjustment's on the pins and get the hang of the small learning curve in regards to adjustments. I certainty recommend this product for those small to medium size boulders. #justevolved