I'm not sure if I'm willing to take that leap. Voiding your warranty for some extra screen real estate?
Rooting and custom ROMs are worth it and safe. Just read, read, read, read some more, get an understanding of what you're doing, read, then flash custom ROMs to your heart's content. I had my G2x rooted for a few months before I even bothered flashing my first ROM to it. I'll never go back to stock. Even though I like stock Android (G2x was mostly stock as were my previous LG phones, the Optimus V and the Optimus M), most custom ROMs actually don't stray too far from that stock look and feel. It's like using Apex or Nova over the stock launcher. It's essentially the same thing while giving you the OPTION to customize it more to your liking. I'm a big fan of Cyanogenmod and whenever I get my Nexus 4, I'm definitely going to flash a CM10.1 ROM... but probably after running stock for a month or so and letting the dev community get warmed up some more.
Currently running Paranoid Android on my G2x and it's VERY nice. Probably my favorite so far.