Getting a bottle filler to gratify your non-brewing friends is a generous act. If that is your main purpose, then I'd recommend going with a bottling cane (with a spring-loaded valve at the end) shoved into the end of a picnic faucet.
But if you will also be bottling for your own use, I join those who recommend the Beer Gun.
Note that it is not a "counter-pressure" filler. It allows you to purge air from the bottle and fill on CO2, but it does not fill under pressure. I've had several CP filler models over the years (all no longer available), and the results I get with the Blichmann Beer Gun are at least as good, with 25% of the hassle.
I've not tried any of the morebeer type of CP fillers.