A GB is definitely worth the coin. They are essentially ready to go right out of the box. I have probably invested 2-3 hours in my Wetterlings falling ax and still do not have it quite the way I want it. While I do not begrudge the time, that effort has to be spent and if I was getting paid for that time would bring the price up to or above the GB level.
Most of the other axes available are nearly pure junk and the amount of effort to get them functional is just way too much or even impossible, it makes the investment in a GB a bargain.
The Fiskars are decent however utilitarian, the Eastwings.....hum….how should I put this….durable, but a Gränsfors is just a pleasure to use.