I like DRL's, especially on a dark truck. In urban traffic, they get the attention of other drivers. Rather than than do the parking light mod with the relays, I opted for a kit made by Philips that took all of 40 minutes to install. These give off a very high intensity light, similar to late model Audis, Mercedes and Porsches. This was extremely easy to install on my 2010 Tacoma, and the lights are very bright.
The Philips kit wires to your battery and splices to your parking lamp (if you want it to turn off when you activate your main lights) and has its own enclosed starter for the lights. They come on automatically when your truck is running and turn off when the engine is stopped. There must be a sensor in the starter box that can tell when the alternator is charging as they won't activate when the key is on...the engine must be running, and yet they power straight off the battery. They're very bright, and very white. Considerably brighter than I was expecting.
The bad news. You have to order these kits from England. They're not available in the USA. Shipping is expensive (each light kit is about $ 80 British Pounds), shipping is $ 45, but the good news is two kits ship for the price of one, so I ordered two of them. The other one is going on one of my cars, but the install will be more difficult.
I'm sure these are not for everyone, but if you want a high quality drl kit and want to be seen, these will most definitely do the job in style.