I would have to say it really depends on what you are intending it for. If it is for home defense, absolutely as you might wake up at night (hopefully not) but with the need for it and it glows to allow you to see it. The chemical that makes it glow is the most expensive item on earth by volume (something like over 2000 bucks per gram as it is so rare). 25 is way cheaper than adding it later (100 or more usually).
Also, the brightness is similar to that of a watch that glows in the dark that is "fully charged" but it glows all the time for about 10 years or so.

They are said to be significantly better than Glock's factory sights. Being pretty bright even during the day. Hope that helps!

It's definitely worth the money. Nice thing is you can leave the pistol on your nightstand and see the sight in the dark and find it easily.