I have a Beergun and I like it for bottling a bunch of bottles at once. It is great for that. However, for bottling just a couple bottles it isn't worth it.
Refracto's are great for AG brewin because you can check gravities during every stage of the process to better monitor your mash, sparge, and boil. Just a drop gives you an accurate sample in seconds as opposed to a full test jar that needs to be cooled and then hydro'd. I think it is a really great tool.
If you use carboys, some of those stackable carboy dryers would be really nice.
EDIT: The beergun isn't worth it for a few bottles because the setup and cleaning do not make sense for only a 6-pack. I use
this for filling just a couple bottles.