This Space Echo clone invites immediately for hours of experimenting.
The effect blends in very smooth (vs Boss) and there's so much too choose in an intuitive way.
It has a good preamp simulation and control of the preamp-saturation. The preamp matches the repeat sounds very well. It has a very userfriendly screne ! It surprised me. It is even the most userfriendly screne I met so far. You can see the tape head combinations, unlike the Boss re's. It is no hassle to dive into this screen.
The expression pedal is also very easy to use with this screen. Just choose level, time or repeats and go. No special actions, remembering numbers, ... NDD7 enables you to switch very fast between expression parameters wich is good for experimenting. Absolutely more userfriendly then the Boss expression pedal input on the RE's. The sound also doesn't warble that much when pushing the expression pedal in time mode. This makes it much easier to use for time expression then the Boss's.
The repeats are maybe less changing in sound, then the more expensive ones. You hear less of the tape machine mechanics .
The reverb is nice but gets less neutral on higher values (shrill). Not a bad sound, but very specific. The biggest difference with the Boss's, apart from the price, is that it is more gentle sounding, blended and the self
oscillation doesn't explode (that much). And the NDD7 is definitely much more userfriendly for hidden modes, especially for the expression input.
For people who prefer it for blending in with their playing (most I think), this is an amazing pedal. For the experimental work, it's very suited. The Boss could be a better choice if you are keen on those detailed space and tape engine sounds in your soundscapes.
Anyway, the NDD7 has definitely it's own place in space echo market and is not a cheap or lesser version of Boss/Galaxy. It is just not as expensive (how is this possible ?)