I bought a Pro 1 last year and I'm very happy with it, although it seems to be older design than the 10 and the 100. I got it at a very good price in the UK.
I don't know if the software and system is the same as the 10 and the 100, but I had to make quite a few test prints and adjust various things (and turn all the auto stuff off) because prints were coming out too dark. I get stunning prints out of it now! Not tried much B&W yet as I have a darkroom, but colour (yes with a U!) prints look fantastic.
A few things, and two I didn't think about or realise, from quite a bit of research I did before buying this. And I imagine they are similar for the 10 and 100 as well as other larger machines:
Yes, it's a big printer. The cartridges are at the front nowhere near the print head, so the pipes are quite long and take quite a lot of ink to prime. Many people have moaned about printing 4 pics with their brand new Pro 1 and it running out of ink, this is why. Mine is now on set 2, and they seem to be lasting well.
According to Canon, these printers are designed to be left fully on (not energy mode or standby) all the time, although the software was set by default to power it down after 2hrs. If the printer is powered down, it has to re-prime the inks the next time it's used, and priming wastes a fair bit of ink. Although this can help to make sure the ink doesn't slowly dry on the printhead and clog it, it's best to try to make one print every month or so, which is a far better use for the ink.
Also, as I always say, be very wary of using anything other than absolutely genuine ink from an authorized seller. The PrecisionColor stuff looks like it's better made than a lot of other 3rd party inks, but genuine ink has been properly designed by people who know what they are doing to work with that particular printer without damaging pipes, seals or clogging the printhead. Unless you have an Epson which will happily clog itself whatever you use in it! Printer ink doesn't just contain pigment, there are lubricants and other chemical wizardry in there to make sure that printer will come to life and print perfectly when you need it, after it has been sat there being ignored for months!