Not trying to push anything here, just to make you aware of other options.
As much as I like Eheims, The Classic models like 2213 (?) with not even a basket for media take me longer to service (I have 2). At least the 2215 has a pull out basket to make it easier (I have 1). And I am certainly fine with the old disconnects - they make routing the hoses through holes in the stand so much easier. Routing double disconnects on Pro models (and I have like 7 of them and love them) can be a real pain, based on the filter location.
I run 2 x Finnex 360 on a 12g long. They are basically a glorified HOB with a basket with 2 compartments. And they are small and light. Cleaning one would take me maybe 15-20 mins, about once a month.
In the end, we pick our own poison :-)
This is certainly true. We do have to choose things based on what we have. For instance, I had never considered the tubing held in blocks to be a problem. The difference in our view is that I have heat trouble and want to let as much air under the tank as possible so the backs are almost totally open. Never thought of trouble fitting it through holes!
For the current use, I am using the Sunsun HW304B on a 75 gallon and it seems right running through a Grigg's reactor. Not a lot of flow and that is okay for me, as I like to add small powerheads where I find I want more movement. I look at the filter as a stand alone item to do filtering, not to do water movement as I like being more able to choose where and how to place that movement. A filter can only move water from input to outlet while small powerheads are easy to hide here and there in places to "kick" the debris in small steps to get it to the filter. Just different thinking?
On a 20 long, the Sunsun 302 seems right running through a Grigg's here also. I also have one of the little $7 powerheads tucked behind rocks with Java fern. I like to keep them waving to avoid dirt that gets kicked up from landing on the leaves. With a fair amount of dirt mixed in with other types of sub my little diggers can almost hide a plant that's not shaking and moving! But I don't want a big flow to keep that in the air or dig holes.
A search of the auction for
Circulation Pump Wavemaker 530 GPH Aquarium Reef Powerhead Suction Cup Mount
should find the small pumps and this particular seller seems to be a steady contender for best price and service as he ships from Milwaukee. Shop carefully as there are many sellers but not all include the same small items like media. I now shop this guy first and think look to see if I can beat his price but he is winning lots of my buys.
Small point on the 302 on a short tank like a 20 long is that the intake plastic is too tall so I cut a few inches off the bottom before adding the screened section. small tanks were not really set for canisters, apparently.