I think they are slightly different flavors of the same basic dish. Cheap, entry-level radios that are mostly marketed to and intended to be used as CB and Freeband rigs. The lack of useful 10 meter features like PL tones are left out in favor of CB toys like echo and talkback, etc.
I certainly would not steer anyone towards them who was a new ham looking for a first rig. You can spend just a little more on a good used HF set and have SO much more that you can do.
For strictly a CBer who wants to play on the "dark side" of freebanding a little and getting a taste of what DX is like, one can certainly put together a basic setup based around one of these rigs (add an omni antenna, small amp, decent microphone) and have an absolute blast! Lots of No-Code Techs used to do exactly this---play on the VHF/UHF bands that the ham ticket gives you, and freeband is your "HF"....I did that for many a year with my old orange 2950, A99, Palomar 225 and a nice D104. Talked all over the world, often times without the amp. And you've got a pretty good sounding AM/FM CB as well.
Also, now that a lot of former freebanders are now general class hams with spankin' new HF sets to play with, many people (myself included) use our former bootleg 11 meter sets like these as legitimate 10 meter sets as an addition to, not in place of, our big bad Kenwoods, Yaesus, etc. I'll often have my FT-847 on 14.230 running SSTV into a wire antenna, while the DX2517 is sitting on 28.400 connected to the Imax with the volume up, but the RF Gain tweaked back a bit. I won't hear distant, sporadic signals much, but if something starts happening on the band, I'm going to hear it. Certainly all these sets are not complete junk---there are far too many guys out there enjoying them for that to be the case (I LOVE my Galaxy). I even run PSK31 and SSTV on 10 and 11 meters with the 2517! It does a good job (but drifts a little, lol).
Nothing wrong with liking these rigs, I certainly do.