Sdoner, show me anything where the quality has gone up. Your friend is right and wrong. Toro now makes a cheaper unit to compete with Mr. Big Box. It still has many quality units for the customer who wishes to pay a little more.
Rudager, watch what you buy. The newer toro products are not the good quality as the older ones. I have a 20 year old toro weed wacker and have not have any problems with it. I rebuilt the carb 9 years ago and tune it up every year. My friend is a toro dealer and said that the quality has gone down in the past few years.
Check in your area to see if anyone has any of last years model Toro with the B&S engine. This is an excellent unit if you can find them.
Individual wheel adjustment was on the top of my list. I rarely intend to change the height and the the weight of all four wheels on one latch my old mower was always dropping like an air bagged chevy when I hit a rut or bump. Can't speak to the new engine, but my Kohler is killer and the super recycler I bought came with a 5 year warranty and four free blades. They recalled it for a potential transmission problem, replaced some screws and extended my transmission warranty to 6 years.
Rudager, I am getting very confused, maybe it is because of the number of different replies. Are you still mainly looking at a single lever height adjustably system? Are you looking at a Toro model 20384. If so you are looking at a rear wheel drive unit. That has the new toro engineered Chinese engine. Did a little more research on the engine and found out that it has a cast iron sleeve, ball bearings instead of cast/machine bushings on the crankshaft, and designed to run cooler. This is one of the top mowers in the Toro line and I would say that it should last 15 years plus in properly maintained. I must qualify that by saying that the new engine is just that, a new engine. It has a five year warranty to work out any bugs if they should appear.