One thing I noted about pistol grip hydros is that you use a speed control lever or two to control forward speed. Is this a pain or do you usually just leave it at the fastest speed you mow at? Also, why do some have two levers and others just one? I hear lots about the cons of pistol grips. What are the pros? Finally, do the Ferris mowers (dual and single hydro) both use thumb controled speed and neutral, or do they also use neutral thumb locks? Just curious about the various technologies out there.