I did a diy upgrade in my 14g biocube. It was just a bit more expensive than replacing the PC bulbs...so heck yea! haha
I just did, 50/50 white and blue.
I only had one ballast, so control of blue and white separate is to be desired, and I opted to not have dimmable as the cost was significantly higher. I honestly wish I'd have done separate control over the blue and white, and had some sort of UV to make the colors pop, but I don't think I'd really use the dimmable, so that would have been money wasted.
Mine was only a 12 led setup, but all in all it only ran me like $50 and an hour of work. Worth every penny and drop of sweat.