when I did mine, the brake lights went dimmer, side markers were brighter, but projected towards the rear, and license plate light simply didnt produce enough light.
All those lights are back to stock now.
In the front, I swapped out the DRL/Turn signal bulbs for an LED projector type of bulb and theyre incredible. The bulb looks really sleek and would look perfect paired with a retro fit, but still looks really cool with stock lights. These are now the only after market bulbs I'm using (besides fogs and main headlights).
Some brake light bulbs can potentially look good and brighter, but you'll want white lights, not red. The cheap-o ones I had just didnt cut it.