Def necessary! Only ones I've done to mine are FDE frame, extended slide release, "butt plug" and I run 15rounders instead of 13's. Thought about doing a new spring and swapping back field goal sight for a red dot or something to just play around with.
I sure like mine. It's an OD green that I picked up from GMThunder. I had three G27s before making the switch to the G26, mainly due to being able to run cheaper ammo.