I've got about 3.5yrs flying Meridians for a Piper Dist., what do you want to know? Payload isn't the best, full-fuel range is 3hrs(500-700nm) and that'll give you a reserve, but only 500lbs useful load after that on newer planes. 188kias Vno sucks, but is manageable.

As far as Avionics, I'm not a fan of the Meggitt's, but they do the job, Avidyne's aren't bad, but their support used to be horrible, I imagine it's still the same if there's any issues. Upgrades to the S-tec Magic AP are nice so you have an IAS mode. Other than that, standard or WAAS Garmins(if I was buying I'd want the WAAS).

I always felt that the Meridian is a great 500nm airplane, it offers a nice upgrade to folks coming out of piston planes. You get all the amentities of any larger airframe(A/C, FIKI, Pressurization, Turbine), with an airframe that is Super easy to fly.

Anything else, I'll check back