I took a better look at the Deltec APF600, now the J&L Aquatics website calls them an "in-sump" skimmer but according to the Deltec website, you cab set them up externally...
Now Euroreef's RC series can also be set up outside the sump so I guess I'm comparing between the RC135 from Euroreef & the APF600. On first glance the design seems pretty much the same. I've heard such good things about both products but never owned on myself. Hmmm; more reading is in order I guess.

From J&L's website:
Its new design gives it the flexibility to hang on almost any brand of aquarium or for it to be used inside or hanging on the outside of a sump.
It's either/or. I have one that I hang on my 44g.

Yes that's true, but I'm not talking about the H.O.T. model...

Sorry - don't know quite how I managed to get those letters so big - computor dummy here. Isn't it the 500 model that is not HOB?

Not to worry; I had to double check myself; the external Deltec (rated for 200gal) has a similar product code to the hang on back model, that's all. The one you're talking about looks real nice, I've read good things about it, but it's going to be undersized for my system both now, & when I upsize down the line.

http://www.myreefcreations.com/index.html
Anyone using a MyReef skimmer? The MR-2 looks rather good & our Canadian dollar is at a high. Dual becketts, quick release, ozone safe, add on risers & great reviews on all MR products. Compared to the PM Bullet 2.

Which model you of MR are you looking at? And try to find a gallon rating from someplace other than the manufacturer.

IMO I have tried many different Beckett's ,ya they are good ,but over rated. your constantly having to tweak them clean the coolection cup dump this clean the beckett. make sure the thing doesnt over flow. To much tweaking and to get a good skimate you have to run wet ,thne its not a good . ANd you need a huge pressure rated pump to blast it.

But Since I have gotten my Euro reef CS 250:mrgreen: MAn All I can say is WOW the crap that its pulling out of my tank. its quiet. Low watts to run even with the dual SP 3 pumps.
And with it running dry its really pulling crap out the thing I have to do is clean the cup every once in while with the Beckett you had to keep it cleanall the time after awhile it would slow down on the preformance if it wasnt cleaned.

THe Euro reef run great even when its dirty. Enough said on that.

So Ya Bullets IMO Crap, Some people swear by Beckett skimmers My self I rather have a strong name to settle on. Euro reef , Deltec, Bubble king, YA YA YA I know I like the expensive ones...

My ASM runs just as well dirty as clean too. I empty the collection cup once a week, and clean it every 2 weeks.

ASM is similar to Euroreef, but cheaper plastic so they are less expensive.