I've always found the chipex kits spot on.
+1 for Chipex. Really good colour match, and if you take your time, you can get good results. I find the best technique is not to dab or smear the paint across the chipped area with the supplied glove but to build up the paint in the chip in layers using a cocktail stick until it's raised slightly above the surrounding original paintwork and once the paint is dry, use the blending solution to remove the surplus paint.
Chipex now supply a small dense foam block for use in the blending process. This wasn't included in a Chipex kit I had with a previous car a few years ago. By wrapping the supplied paint removal cloth around the foam block, applying a small amount of the blending solution to the cloth and then
very gently rubbing this back and forth across the filled paint chip
without applying pressure will remove the surplus paint and leave the chip repair filled with paint. It can then be polished and waxed and job done!
I've found the key is to take your time and not rush. I've not had any really large paint chips to repair, but those I have repaired, the Chipex kit has worked well.