Yinger, I'm not *nervous* about the riser anymore, as I was before setting it up. Riser or not, results are what's important. And I'm very happy with it, being only 3 days in. I'll see what day #4 looks like when I get home.
The RS250 is a great skimmer as well! Are you running it with the stock Gen-X pump? I bought the Eheim 1262 for mine
Regarding taking the skimmer apart, if you are looking at ATB's and BK Deluxe's, the ATB comes apart "the most". Then the Deluxe, then SM.
I wouldn't really say that the SM comes apart for cleaning, since the bubble plate is not removable, as it is in the Deluxe and ATB.
The only removable parts on the SM are the baseplate, collection cup, and wedge pipe. By removing the baseplate, you can clean the bottom of the bubble plate. You can clean the top of the bubble plate by reaching into the skimmer body.
Here's a drawback of the riser tube. It will be hard to clean the area between the skimmer body and riser tube unless you have really small hands. I'll have to clean it using, perhaps, those acrylic-safe algae cleaners that come on a stick.
I'm sure your decision is tough. Mine was. I like to skim dry, and when Klaus said SM needs to run wetter, I was nervous. I decided to give it a try because Kennettson1 was able to skim dry. Luckily, I've been able to produce the same results - and I have a smaller tank than he does! In the end, it worked out for me because I got a skimmer with a bigger pump than the Deluxe, it's cheaper, and fits in my sump w/o modification.