The question I would have if buying a used one would be, "Why are you selling it?"
Those radios are known for programming and operational complexities, and you'll find that many of those who eventually sell their x36s do so because of that.
I've programmed...and repaired...a handful of those x36s for friends, but I don't...and would never...own one.
And until the scanner industry (such as it is) realizes that the the base of the customers are not those who enjoy sitting up nights in their "shacks" trying to figure out hidden programming quirks or "finding" new talk groups, but are those, such as volunteer firemen, cops, buffs, etc., who use the information gleaned from those radios as their activity, even to the point of necessity, and that pulling over to the side of the road while enroute to an emergency just to change to the next channel..or even raise or lower the volume....is really a setback and a detriment, will things improve.
Maybe the "scanner industry" should try and research the old specs from a very popular radio company in it's day, "Sonar Radio" out of Brooklyn, NY, and take those easily used, multi-channel, radios, and adapt them to present day technology.
Until then, this so called, "hobby" will die a slow death.