I bottle off of a keg. It takes less time and is cleanlier than using a bottling bucket. If I want to bottle condition, I can still prime in the keg and fill using my setup. It takes me little time, whereas many people find bottling to be a chore.
I begin by setting up my equipment. I've got my things stored in the cellar. It takes me 5 minutes or so to take two trips down and get everything put together.
Sanitizing bottles and putting them on the tree takes a few seconds a bottle. Couple minutes for a whole batch. I keep sanitizer on hand for sanitizing my kegerator, and purging equipment, so there is no need to make a new batch. I use demineralized water from the store (5 L bottles) and add the Star San right into the container, filling my smaller containers from this (stored in the cellar).
I use a carbonator cap and PET bottle with sanitizer to sanitize and purge things, including the beer gun. If you invert the bottle, sanitizer is pushed through the lines. You can leave it sit for 30 seconds, turn the bottle right-side-up and then purge using the CO2 in the headspace. I refill the CO2 pressure in the bottle after a session of filling, but it is enough for all the purging and sanitizing needed before I put things away.
Filling the first bottle causes a bit of foaming, but it is still acceptable and I cap on foam. If it isn't 9 AM like today, then I just drink the first bit to chill the lines down.
The second bottle on look great. No need to chill your bottles, the cold beer and wet glass are enough to keep foaming minimal.
I can close the door on my 3/16 ID line without it pinching the line. I bottle with the door closed.
7 PSI (0,5 bar) isn't too much, and leads to a pretty quick fill.
Carbonation is great, oxidation is minimal, and the beer looks great having come out of the keg, carbonated, without any yeast sediment.
Today's filling session took me under an hour. During this time I:
Got all my gear out
Sanitized what was needed (Caps, Gun, Bottles)
Bottled off a keg
Sanitized the Beer Gun and beer lines in the kegerator
Hooked up a new keg and filled the lines
Cleaned my kegerator interior, countertop, drip tray, and tower
Put all my equipment away
Drank the 250 mL of beer that didn't quite fill a bottle and what was left in the lines