I did install them, and TBH I don't think I can tell a difference in sound. For the peace of mind of knowing that my capacitors will be fine for a while, I'm fine with that.
As far as that particular kit on Ebay, I would definitely avoid it. Some of the capacitors were rated for the wrong voltage for the ones they were to replace. Luckily, I was having the work done at a friend's vintage stereo repair business, and he had the correct ones.
Unfortunately, the headphone out is still noisy.