Especially in Vertical Speed mode the autopilots of all planes (as far as I could notice) are not respecting the target altitude. Before someone tell me I'm doing wrong, that's what happens: I select the target altitude with the altitude knob, I press VS and select the rythm of descent in ft/min (for exemple) with the Auto Pilot Master ON, so the plane starts to descend and when it reaches the target altitude it simply continues to descend. When you're a lone pilot busy doing a lot of things in the cockpit especially near the approach phase you gotta trust that the autopilot is going to perform it's functions properly or your flight becomes a mess. I really like Xplane physics and even graphics styles and so on, but these annoying bugs are starting to make me get really disappointed with the sim.