The plane I'm taking lessons in (34Q) is also rentable by the hour. Two instructors also use it to give lessons. Last summer there were 20 of us on the roster, which meant that between lessons and rentals, she was hitting her 100 hr inspection about every 3-4 weeks.
They've been doing various upgrades over the past 6 months, so there has been a significant amount of downtime where the weather was good, the instructor and I were both available, but there was no plane.
Adding the G430 was nice. The paint really wasn't that bad, but they wanted it to match the rest of their 'fleet.' You see the company that runs this particular school is a local corporation that also owns a Citation, a KingAir, and a Saratoga. Those three have the same paint scheme, so they wanted 34Q to match. She was supposed to be gone for 2 weeks, but ended up being gone for 6 1/2.
I get that they want to have a nice plane for rentals, but none of the upgrades involved safety or usability as a trainer. The students are most of their income as a flight service, and we pretty much got put on the back burner.