All in all I think he's right on with modifications and why one should modify, I just have a lot of issues with permanently destroying part of my gun.
The more you run your gun, the less you care...mainly because you destroy it anyway. You see the slide on Jeff's gun? That wasn't a modification. That was tens of thousands of rounds, drawstrokes and that gun hitting the ground repeatedly. Imagine how the frame looked before he took a soldering iron to it. Wasn't exactly A+
Like the stipleling having other less permanent options (Talon Grips)
If you didn't notice, talons grips and the stippling we do to our pistols have little in common. Other than the front strap, all the texture added by the talons is in all the places it is least needed when utilizing a proper grip.
If you don't like the grip on the old frames, you can upgrade the frame of any glock under their warranty. It's only $100 and keeps you in warranty. Plus you get all of the advantages of the newest frame (finger grooves, adjustable grip thicknesses, beavertail add-on, stippling/RTF, reversable mag release, accessory rail, etc.).
They will also re-Tenifer the slide and frame for $60.