I'm a big fan of the glass panel and wouldn't want to go back...but those things do become obsolete and will become an ongoing maintenance consideration. The original Advanced Flight 4500 and 3500 that I bought the plane with were my introduction to glass PFDs, and I love them. But, the reality is that once you hop on that merry-go-round, you're kind of stuck with the inevitable upgrades. They do wear out, components break, displays stop working, and the components and functionality improve at an amazing rate. I'm currently replacing my 4500 because the AHARs died. It "could" be fixed thanks to the foresight and ingenuity of Rob Hickman, but how long can they continue to maintain that obsolete glass? I opted to upgrade to brand new, bright displays, fast processors, more functionality rather than trying to breathe a few more years of life into that trusty old display. In 10 years...the new owner of that airplane will likely be faced with the same upgrade conundrums. Conversely, some of the trainer 172's at the FBO, no glass, have round instruments that have been in those planes since the 70's. Personally, I'd never go back to just round gauges, but one does have to accept the downside of the new electronics. Is anyone still using a 10 year old iPad or iPhone?