Can't help you on the website, Festool has now Cookie walled their websites (why make the content good, when instead we will block you from viewing them unless you consent to cookies). But what I can sorta see there is interesting as in a different thread people were pushing the idea that "F" was for "imperial" (and there was some basis to that), but this is making it look like it must mean something else as there is only "imperial" routers in the US. I think it should say something like OF 1400 -F and OF 1400 -F Plus, to show kit verses not kit
Yeah, I thought F was an odd distinction in this case. I think I figured it out, though, and I think the people taking "F" to mean "imperial" were right.
I believe the non-F version is the old metric US version - why it's still on the website, I couldn't say. Years ago (as in pre t-lock systainers) the OF 1400 came with the edge guide, but I don't think it has in a long time.
I think maybe the reason that version doesn't show as coming with a systainer is that it didn't come with a SYS 4 TL and the old, original systainer it came with just isn't showing on the product comparison. So from that list it looks like it doesn't come in a Systainer - which isn't true, but the Systainer it came in wasn't a SYS 4 TL.
Somehow I missed this in the product description the first time:

Thanks - without your reminder of the F=Imperial theory, I probably wouldn't have caught that line in the product description.