I prefer the Volt+d to the volt+, though my volt+ is the board only version, not the one wiith the case and stepped attenuator.
It seems to be every bit if as good at the things the volt+ does, if not better and the extra headroom from the second tpa3118 does help.
The tougher question might be whether it makes sense to stay with the the tpa311x family or go to the Tpa325x amps.
My initial impression is that the fx3250 sounds better than the Breeze. The fx3255 seems to sound even better. I'm sure the tp325x have more bass
and the treble sounds a bit smoother (partly because there's more bass). It's also more dynamic.
There are a lot of people who would say that's reason enough to go to the tp325x family. It's definitely the case for lower efficiency speakers that have bigger woofers.
The tougher question seems to be "first watt" sorts of things, clarity, harmonics, phase, micro-dynamics. The tpa311x is in the tradition of the ta2020. The tpa325x seems to have a different presentation, a sort of creaminess that makes everything coherent but maybe not quite as airy as the volt+d. Obviously, I'm comparing a fairly serious attempt to get the most out of the TPA3118 vs. some company that copied the TI sample board, stuck it in a box, etc. I'd be curious to see what a serious attempt to get the most out of the 325x chip might sound like.
If one likes amplified music with drum solos and lots of dynamics, the TPA 325X series is already probably better for a dance party. If it's more about small scale acoustic music at low volume and making it sound rich and complex, it's a tougher call. It could be that the 325x series wins there too, but the Volt+d is really quite good at the "refined" stuff.
I'm still trying to get a sense of how the two compare in that realm.