The H440 is surprisingly easy to work in. it does have a lot of space inside.it wasnt the fact it was small as such it just looked compact and cramped in size. not sure on its dimensions.
i now have the bequiet silent base 800, which compared to the cm haf i previously had, looks small as well.
If you don't install a lot of HDD trays it has good space at the front.
I like my case for airflow with having the 3 120mm at the front it runs cool and its actually pretty quiet