I "assumed" that to be true since it is true for the R2880 and R3000 (From Bob Petuska on DPreview) - sorry about the miss-information! Same with my 2880, changing a cart mid-print is totally invisible.
I've use my R3000 for months now and I can replace a cartridge without any priming whatsoever. Works mid-print without a hiccup. I wonder what's different about Bob's printer and mine?
Also, I am a low-volume printer (maybe 10/month average) and I have never had a clog. I do print a nozzle check every few days or so and about once a month if I haven't printed for a while I print a 6-color purge pattern (downloadable from Inkjetcarts.us). I love my R3000