We moved to 100% Canons (MF525dw - desktop AIO, C5550 - floor AIO, ICLBP312DN - desktop print only)
They have been great overall - very little downtime in the 2 years we've had them.
Only complaint I have is the ADF (automatic document feeder) on the MF525dw doesn't hold it's position great. Tightening the screws on it seems to make it better for a while.
We looked at Ricoh and Kyocera, and Canon just crushed them on price, more than 10% savings over the life of the contract.
We did a 5 year lease, including maintenance and toner. Management made me push my pre-paid page count be a little lower than our previous 2 years showed we were using to ensure we didn't overpay... so instead we pay a slightly higher fee for that - but that would have happened regardless of vendor.
Interesting, We get tiered pricing with Kyocera and that blew the competition away. Canon, at least with the local agents, couldn't compete. The TCO over 5 years was significantly better with Kyocera.
Mind you we don't pre-pay prints, it's per-click cost (copies & scans are included too), so our monthly costs are variable BUT we're still saving a lot compared to the old copiers we replaced.
Interesting. The click rate is based on the prepaid amount. I looked at our yearly over the last two years, then we went like 10% less then that for our included cost. It's baked into the monthly cost, then yearly we get a difference bill, so calling it prepaid - not really, it's monthly paid.