It's eye-catching, at first.
On closer inspection, The DP-01/FX reveals itself to be not as highly capable as the cassette Portastudios that we take for granted.
1)
The DP-01/FX has only 2-inputs with literally no front-end input-mixing, no input-side EQ, or other capability. Just assign Input A OR B (individually) to any one track, or assign INPUTS A AND B simultaneously to two discrete tracks, but there's no facility to assign INPUTS A AND B simultaneously to ONE single track. (Input design a'la the Porta 02). On
the DP-01FX model, you may engage an effects loop into the input chain, but that's pretty much "it" on input-side capability. The non-FX model has no input-side signal mixing or EQ, just two basic inputs, routed straight-in-to-tracks.
2) The DP-01/FX's EQ is intended for outbound signal processing only, (no input-side EQ at all). It is 2-band semi-parametric (sweepable) EQ, with the High/Low (cut-boost) knobs on the top panel mixer surface, (which is smart), but the actual sweepable frequencies are set by sub-menu, (which is not). These "EQ-sweep" frequencies are selected by fixed "set points", and are not "continuously variable" sweep EQ that you may be used to in the analog world. IMO, that's a cheesy half-assed EQ design, but YMMV.
3) The DP-01/FX only records 2-tracks simultaneously, max. That's a HUGE and common limitation in the field of modern 8-trackers. Pair that with NO INPUT-SIDE MIXING OR EQ, and it severely limits this unit's capabilities.
4) It's still largely a menu-driven box, despite it's outward appearance.
In my own analysis, the DP-01/FX is not as flexible or as powerful as your typical cassette Portastudio, such as the 424mkIII. It doesn't even come near the technical design of the 246, 464, 644, with their fully capable mixers and 4-simul recording onto 4-tracks, or much less near that of the 488, 488mkII or 688, which record 4, 4 & 8 tracks simultaneously (max), respecitively. ALL these cassette Portastudios have TONS of input-side mixing capability, in-the-box, which the DP-01/FX severely lacks.
Coming from an 8x8x2 mixing environment, with 8-simul-max recording onto 8-tracks, such as with the Tascam 388, the DP-01/FX does not impress me, in comparison. It's not all that. I am not inclined to get a DP-01/FX, for these reasons, above.
Even a Fostex FD-8 blows the DP-01 away, because the FD-8 has a more highly capable mixer, and will record 8-simul-max with an ADAT-I/O capable outboard mixer.
I'm sorry, I'm spoiled by the likes of the 488mkII and the 388.
The DP-01/FX has GLARING DEFICIENCIES, and does not compete on technical merit of design or user-capability, in comparison to almost any medium & high end cassette Portastudios you'd dare to compare it to. The DP-01/FX is literally CRUSHED by the likes of the 388, which almost goes without saying.
The DP-01/FX is WAY BETTER than the Porta 02, which is the best thing I can say about it, in a positive light.
As with anything, YMMV.