I flew TPA-MIA on the Beech two weeks ago.

I sat in 1A, and asked the co-pilot to leave the door open, which he did. I had a great view of the cockpit and control panel, which was pretty cool.

Your friend can expect a constant hum and vibration, but beyond that, if the skies are clear, it is a really easy and nice flight.

The poster who said the plane made the 340 look big is correct, but I've also flown on a 6-seat Cessna (a true "crop duster"), so the Beech is pretty roomy by comparison. lol