Are you referring to internal doors or doors to the outside? My outside doors are solid frame and panel doors made from sapele. They are VERY heavy. I can't think why you would want solid doors inside a house, unless you are planning to run your house Fritzl-style.
My external doors are 8 years old, and I revarnished them over the last couple of days (by coincidence). Earlier this year I had to have one of them sanded slightly as it was sticking. A minor inconvenience compared to the quality they offer day-in, day-out. The frame and panel construction should take care of most of the seasonal movement if they are well-made. My doors show no sign of warping whatsoever.
From my experience, I can recommend solid doors 100% over other doors. My previous home had hollow-core doors and they gave me many more problems as well as being less secure.
I also think the quality of the hardware and door frame makes a huge difference.