These pens are great! We first bought a pack of these ages ago, (over 2 years), and they have lasted and lasted. Finally, a couple of them seemed like they were going to give up the ghost, (after a huge amount of use), and so I have just invested in a new pack. I hope that these last as long!
Whilst you might think that glitter pens would be a bit...well...girlie, these pens really aren't. The only "girlie" colour in there is pink, and my two little boys enjoy using that to write cards to their girl friends, or grandma etc. The other colours are gold, green, blue, orange, and purple and they are all wonderful, vivid colours. The sparkle, whilst clearly there, is fairly subtle. The pens produce a lovely, relatively fine line, so they're not great for colouring in but for producing writing that you want to stand out they really excel! We absolutely love using these to write cards as they really do make the writing look so special. A minor issue that we've come across is that you get a lot of colour out of these pens and the writing can be wet for a little while - not so much a problem for most perhaps, but my little left-hander often struggles not to smudge his writing when using these. Of course, that would be the same with a lot of other pens too, and he loves these ones so much that he persists with them.
When the ink in our new pack of pens runs out, we will be buying more. For us they have been amazing value for money...so much so that perhaps I should buy my own pack, instead of constantly stealing the kids pens!! :) Highly recommended.