Total waste of material! - Shadow Systems Elite Trigger Assembly fits Glock Pistols

This is probably the worst trigger I have ever shot. I feel that the factory trigger is a better option over this. The trigger safety does not work as it is supposed to.......while at the range, the trigger, more than one time, stuck to the rear and had to be manually/forcefully pushed forward. Luckily, being the kind of guy who has multiple parts always on hand, this trigger was replaced with a stock trigger while at the range.
Now let’s this if this was a true “life or death” situation.....I wouldn’t be writing this.
Needless to say, I am 100% unsatisfied with this product.
The guy on the Shadow Systems website said he had to file his frame to make this work. This to me is wrong. As a drop-in trigger, this should not happen.
So Shadow Systems, what happened to research and development, quality control and quality assurance?
Needless to say, I will not recommend your product to anyone.