The hrr216 (vka) for $399 is a decent mower. The handle height is set so you can not raise or lower it except if you raise or lower the wheels. Very bad feature if you are over about 5'10" tall. The hrx217 (hxa) is actually $699 and does have a dominant transmission. THe handle will raise and lower and fold easily. The engine is a 190cc, which makes it less likely to bog down in thicker grass.
There is not a mower out there that you should keep the transmission engaged when pulling backwards. That is how people most often wear out their drive parts (wheels, gears, etc). They do not fully disengage he transmission before pulling backwards.