Also rainbow's have changed through the years. If we look over the past 30 years we had the D series and then when they updated that to the E series we got a lot of improvements, primarily a new shape and new connection parts and hepa filtration. Then while in the E series we got the direct connect functions where we didn't have to connect the electrical cord through anything, and we also got several different updates to the aquamate during the E series. Then recently with the SRX series, which is what I have, we no longer have to latch the basin onto the machine as well as a larger hepa filter. Idk about yall but that was a huge key point in me getting the SRX over the E2 Black. Also going back to the D series we had 1 speed, and then the same with the E series and then we got two speed and now 4 with the SRX. So rexair had made drastic improvments over the past 30 years. Also rexair has improve the sound quality through the years, whereas kirby can't and hasn't address the loudness of its machines, which Im sure its something we all want addressed at some point. What has Kirby done in 30+ besides, name, color, belt lifter shape and headlight shape? Not much if you ask me.