I have not used one myself, but asked the same question a while back, and was told both good and bad things about it. The portability is very convenient, and the gun is apparently plenty powerful. Also, the engine is maintenance free - no oiling. The drawbacks are that it is apparently quite heavy (6.5 pounds) and I was told that you had to compress the tip quite forcefully to prime the cartridge, making it difficult to nail more delicate pieces. Do some searching around and you should find some discussions.