They are worth it to me after looking at a lot of knives you are getting a lot of knife with very little added weight. I've come to realize that this minimal weight can be an obsession it's got so bad that my hunting partner and I have thought about changing our names to Titanium and Carbon since most of our gear consist of one or the other. There are a lot of great knives out and a lot of great builders but there is just something about a Titanium skinner with a skeleton handle that just catches my eye.
I haven't had a chance to use mine yet, hopefully I will be using them a lot here in the next couple months, but as far as using high quality knives I am sold on that idea. I used cheap fillet knives for years and then my wife bought me a custom fillet knife for Christmas a few years back, and it totally blows away the cheapo's that I have used in the past. We go dip netting for salmon every year and when you're fileting 50+ salmon at a time you become very familiar with your fillet knife and it doesn't take long to appreciate a high-quality knife.
I like the idea of having a skeletonized knife with a kydex sheath fir my neck. I can resharpen steel with high carbon content but the Ti, never done it before.
Here are the two knives I ordered. The Skinner is in titanium, and the caping knife is stainless steel. The weights pictured are in grams, and it's hard to tell from the picture, but the caper is 20 grams.