The Rails on those GFS Tele Neck Pickups Aren't as wide as the String spread at the tele neck Possition. Which means the High e, and Low E strings Don't get picked up as well as the Rest of the strings, So they are MUCH quieter. Which (for Me at least), basically makes the pickup useless.
Not only are the Rails not as wide as the String spread, but To make matters even worse The rails are radiused at 7 1/4", so if your Useing a guitar with a modern Fretboard radius (Most modern Fender telecasters, and similar guitars, have 9.5" radius), its just gonna accentuate the unevenness in string Volume even More when on the D, or G String, Compared to the E strings.
Now if you were to Grind The Rails to a Flat Radius, Rework your Nut AND bridge for a narrower String spread, and Be willing to Open up the hole on your Pickgaurd a bit (did I mention the GFS Lil'punchers are also To large to Fit in a standard sized tele pickgaurd route?)........Then Sure Its a great pickup.
Personally I wouldn't recomend those pickups to anyone. I recently bought a set of they're "Modern Vintage" Lil' Punchers. And they Do SOUND good, And they're Cheap. But with all of the Problems with them, I wouldn't recommend those to anyone. Other Gfs Pickups I've tried were fantastic, But I wouldn't recommend the Lil' punchers.....I mean Unless someone only wants to Hear Four Strings when they hit an Open G chord.