First the Eheims don't have a custom volute like the Askolls. That in it self is a problem. Eheims draw far less air than the Askolls, possibly the solution as to why one lasts longer than the other. Second take all the pinwheel pumps you have and get a PF (Power Factor) reading on them. Then take the PF reading on an modified Askoll and that might be your answer to why the Askolls may fall short. Something called going over the limit of which the pump was designed to do. As with the Eheim pin wheel it is not driven to that extreme.
well, one can hope that in 15 years people are able to run their askoll trouble free that they had purchased over these last few years. Anybody have 15-20 year old askoll pumps in service? Eheims don't appear at all to exhibit motor problems when used as pinwheel pump. many sedras around going strong for 7-10 years now. I believe in longevity, when askoll has longevity, then they earn their place and reputation(I don't consider sedra any way equal to Eheim, but they work well for a long time when taken care of and they are actually a nice cost effective choice), til then, if it is a throw away like most pumps after 5 years, it is just another pump like a sicce surround by hype but falling short in long term reliability.
Yes I am skeptical of the hype... probably 90% of products out for the aquarium industry are all hyped up and exciting at first, then fall short and are nothing but problems and headaches for the consumer... I try not to jump on any bandwagons. I did in the past, cost me money I could have saved for my daughters future... So, I ask difficult questions and weed through the hype and BS... when the final outcome is a lifereef will cost 600 bucks or so and use 3-20x the watts every minute of every day... all to simply allow me to not have to spend 20 sec. once a week with running rodi through my airline... well.... puhlese.