DW top feeds I cannot comment, however they look like remanufactured Bosch Top Feeds or similar.
DW side feeds are absolute garbage, I initially had good experience with them on the SR platform but on a RB they're just a load of horse droppings. I'm led to believe that the inlet port design of a SR vs A RB is slightly different so the atmomisation characteristics are different.
Anyhow stick to local stuff, you'll end up swearing less