This is not a 'must have' tool but if you do your own wrenching, it's useful, particularly for precision applications of grease in tight spaces, like re-lubricating 'sealed' bearings (after you pick the seals out), headsets, pedal spindles, etc. It's not expensive so if you have room in your shop or tool storage, it's something that's nice to have around. My main issue with this tool is the design of the grease canister. It lacks a cap on the bottom so dirt can potentially contaminate the tube. I'm keeping my eyes open for a rubber cap to use on the bottom and have confidence that I'll find something suitable. The other issue with the canister is that it lacks a self adjusting plunger. There is just a plug that you have to push up manually to keep the grease under pressure so that it self-feeds as it's used. Kind of like the whole plunger was an afterthought. Otherwise, it's a great and useful tool and no regrets on the purchase. It's good to save the box it comes in for storage. If you don't have a clean, sealed storage container, this thing is going to be messy and will likely get contaminated.