If you can. Canon told me with the 8300 I couldn’t get parts for many things. I had an electronic error and they were wanting to replace a main board for that but boards were no longer available. There was only one outfit in California that had one to sell me for $700.00. I installed it myself since it wasn’t difficult but it still didn’t work. So that was the end of the line for me. After that I found out a guy in town was a retired tech that could have worked on it but I didn’t know about him. But for this printer he might not have been able to get parts either.
You can look up the availability of 8300/8400 inks and heads as well. There is an end date and if it’s not here yet it will be very soon. Actually I don’t know if they keep them in stock anywhere. Haven’t checked lately.
Good insight. I have a 6400 and 8300 and if they ever have any problems (none so far thankfully) I'm just going to get them repaired instead of replaced.