UPDATE 7/21/20: I've had it for over a year now and still love it. I broke a lot of rocks with it and had no trouble getting my head loose. In fact, I don't see any real signs of head deformation either (the head on my 16lb hammer has visibly deformed over time). In my opinion it is worth the money. First review: I've used a 16lb sled to smash random rocks in our area for many years. I'm cleaning out a barn area this year and decided to do something bigger to (hopefully) take things apart a little faster and with less bumps. At first I was surprised that there really aren't many options for 20lb sleds. I first bought the same brand of hammer as my 16 lb hammer and the head fell off on both the original and replacement hammers. This surprised me because I thought I paid enough to get a decent quality hammer. In the reviews I saw someone mention this hammer. Although I initially objected to the price, I figured it was worth paying a little (well, a lot) more if it means getting something that won't let you down. So far this hammer has not disappointed! I like the pen too; It really helps dampen the vibration when hitting hard, stationary objects.