Just look at the differences:
^ Cobra...Wilson ETM...Cobra.
Just look at the weld quality!
Look at the fluid bends on the Tripp and the feed lips are CNC finished. NO COMPARISON!
Steel slide stop interface.
When you build mags for a living all your R&D goes into that product.
When you build guns for a living your mag is a item in which you can cut cost!
You guys come here to ask questions and help others. When I make a recommendation it's based on engineering experience and not on blind loyalty to a mark!
My advice is free and should you not be 100% satisfied, I will refund your money!