Yep, totally agree, flush with fresh Dot 4 at least every 12mths.
Treat new Dot 4 like it's Nitroglycerin, never shake it, if u drop a bottle it'll be full of micro bubbles, so best not to use it for a few days.
Brand is irrelevant, Dot 4 is Dot 4 ... nasty toxic shit, use nitrile gloves, avoid latex, Dot 4 rots latex in minutes.
Dot 4 destroys paint work, so best to cover bike as much as poss with a plastic sheet of some kind too.
Use with caution, any spills, wash it off with lots of cold water.
Personally I flush my clutch every 6mths, brakes every year.