The 21"self-propelled (hru 214 /gxv120)second from right, I picked up for $50 and boss has made it hers. It has a mulching plug a soft catcher and a tin grass box that fits like a catcher but it throws the grass to the left and does a nice job. On the far left (hru 195/gxv140) and your spot on it is the best to mow with, very quiet and smooth. The (hru194/gxv120) second from left was the last one I worked on and does a very nice job. They all leave the grass looking good ,even the (hru196/gxv160) on far right but its a work tank and a bit more effort to push around.
Grumpy, I'm sure I put a new pre-filter in the gxv140 ,I'll have a look .cheers.