It’s a matter of what you expect to accomplish for your money that you invest. I of course have the GRT-III trigger blades installed in my guns that will accept them. But whether I own one gun or a hundred guns with the GRT’s in them isn’t what matters so much to people and why I don’t even mention it. What really matters is what the GRT-II trigger does and how well the GRT-III trigger blade is accepted and viewed and the recognition that it has received from other people all over the world because of it's outstanding performance.
The GRT-III trigger blade is recognized within the airgun community world wide and has had articles written by several prominent airgun writers including writers such as Jock Elliot, J P Shelton, Joost van Gerven to name a few, as well as well articles written about it in well known magazines such as Upland Hunter, Airgun Hobbyist, AK56 (in Europe) and others. It will be represented at the largest air gun show in Europe in Germany in March. Yes, the GRT-III trigger blade has won world wide acclaim.
But why is the GRT-III trigger blade so successful? The GRT-III trigger blade is successful because it not only resolves the trigger pull issue of the factory trigger but the ergonomic issues of the factory trigger blades as well, something that trigger mods cannot do. The ergonomic issue is just as important and maybe even more so when it come to accuracy along with consistency. Isn't that what shooting is all about??? The GRT-III trigger blade is undoubtedly the most widely purchased single upgrade investment in any gun that has the Theoben/Gamo type trigger.

And why can be seen here.
http://charliedatuna.com/new_trigger.htmAnd look at what the airgunning community has to say. That says it all.
http://charliedatuna.com/MKIIGTXTriggerTestimonials.htmYou can certainly buy less expensive mods for the factory triggers from a couple of sources that will reduce the trigger pull, and they will work, and if that’s all you expect from your gun, then by all means, buy it. But….. if you expect along with an improved trigger pull, a big improvement in accuracy, consistency with an improved firing cycle time after time, then look at the alternative. It may cost a little more but you get so much more for your investment. It’s just one of those cases of "you get what you pay for".