I agree that Aerus (Electrolux) cleaners aren't known for their deep cleaning but rather for their sturdiness and reliability along with good customer service. With that said here's the best way to DEEP clean carpets without the need to rely on deep cleaning but cheaply constructed cleaners (note the first letter of each sentence):
Ditch the outside footwear.
Employ the vacuum cleaner at least 2-3 times per week--and soon after a mess is made.
Encapsulate or extract carpets periodically by shampooing; eradicate spots as soon as possible.
Protect soil-prone areas with rugs or runners that can be laundered, wetmopped, or shampooed as needed.
As for Electrolux upright dust leaks, the pre-filters and after-filters (as Andy mentioned) mitigate that.
Has anyone seen the EVERYBODY LOVES RAYMOND episode in which Ray purchases a Humm vacuum cleaner from a door-to-door salesperson when he sees the "wow" factor of the dirty tank water after vacuuming? When Ray and Debra find out that Marie had sent the vacuum cleaner salesperson to their house because she doesn't think it's clean enough, Debra tries to prove to Marie that everyone's house has a "wow" factor after vacuuming with the Humm. Instead, Marie is "wowed" after Debra vacuums in her and Frank's house and the water is clean afterward! The point is that Marie cleans and cares for her house so regularly that she doesn't need a Humm vacuum cleaner.
(Season number: 5 Episode number: 18 Air date: March 19, 2001)