Kirby convert here
I picked up a Kirby G6 from beside a dumpster a little over two years ago and now I own four. They are indeed very well made machines, made to last and made to be rebuilt so they can last a lifetime. Sure, you can pay through the nose for a brand new one, but they're quite affordable on the second hand market. I recently picked up a pristine G6 with its attachments for $50 at a thrift store. Belts and bags aren't that expensive if you buy them online. Your best source for those supplies is eBay. Although the fans are vulnerable, Kirby makes them of a special plastic called Amoled, co-engineered with NASA, that's tougher than Kevlar. You can even retrofit older machines with these new style fans as well. It's entirely possible to take a 24-year-old G3 and upgrade it with just about every technical innovation that has been added since.
For what it's worth, I don't consider myself a Kirby snob; rather, I appreciate their superior design and they work admirably for my needs. I'm also a fan of Electrolux canisters and pre-TTI Hoovers, but these days, Kirby is my brand of choice.