I'm really pleased with the G550. It replaces a Canon TS8050 which has been amazingly reliable for 10 years. The G550 was easy to set up following Canon's excellent online step by step directions. The photo quality is really impressive with good colours and fine detail. Text printing is noticeably sharper than on the TS8050 though a bit lighter. It's easy to adjust settings to make it darker. Envelopes print nicely. I'm happy with the print speeds. Good to see that the ink absorber can be replaced cheaply on this model.
My only complaint is the dismal LCD screen which was not designed for older eyes. Thankfully most settings can be done on the computer screen. Over the years print cartridges have cost a small fortune, even using compatibles, so I'm looking forward to lower running costs with the ink tank system.
Well done Canon, but for others benefit, please make the LCD screen bigger and put a light in it.