I fitted a set of Phillips DRL lights around 2 years ago as I was fed up with other cars just pulling out or clearly making little attempt to check for other cars before doing so.
I was concerned they would look stupid or even make the front of the car look unbalanced given the low fog lights on the front.The set I bought werent cheap but I anted something that worked properly and was fit for purpose.These are wired from a main unit that is connected into the side light buld wiring and when the ignition is turned on and car started they are illuminated.When you turn either side or full lights on they are extinguished so comply with the law as it stands.
The car has passed 2 MOT,s since being fitted with no comments from tester.My own view is they are a good idea and do give a very clear light even in bright sunshine and make the car much more visible for other road users without it looking like a christmas tree or a pimped up limo.
TBH I am glad that I fitted them and am sure they have gone a long way to making my presence on the road better so surely that is the purpose of them.As said they were far from cheap but have worked without fault for in excess of 2 years.
Pity I cant post pictures or I would be happy to do so ,but my IT skills dont extend to that