As with AIR's other synths, don't let the low price fool you. This is a powerhouse.
It's a virtual ROMpler, a "workstation," great for sketching out ideas.
The thing is, the sounds (over 2000 presets) are so good that I often start out "sketching" with Xpand!2 and end up using it in the final mix.
Great basses, pads, polysynths, leads. Some very usable drum machines. Excellent arpeggiator.
It's not without a few (slight, IMO) weaknesses. The orchestral sounds are not something I'd ever use in a final production, but that's to be expected. Orchestral samples take up a huge amount of space. Still, they are sometimes usable when layered with synth sounds.
The GUI is not resizable, so if you're on a 4K monitor, it'll look pretty small. Not a big issue because it's a ROMpler, you use the presets.
The underlying code hasn't been updated in many years, but this actually works in its favor: it's very resource-friendly.
A smashing deal whenever it drops below $10. I think my licenses (I have multiple for my various DAW systems) were purchased for $5. Whatever, it's worth many times that.
Xpand 2 is pretty insane for what it is. I can make big and intricate sounds very quickly, and I appreciate the selection of onboard effects (although I would really like to have more than just two slots for them.) I am kicking myself for not getting Xpand sooner, because there was a time when I was very heavy into the slightly more cheesy, Ocarina-of-Time-esque sounds, of which Xpand has PLENTY.
A valid issue is that there are very little options for shaping the sounds individually, or for shaping the overall sound. And admittedly, given how I eluded to Xpand having a lot of voices fit for a SNES (or N64 actually), it does not easily have a strong sound. It remains an inspiring tool to use. I do recommend it, because it will get you very far.
The designers have done a good job providing loads of "stock" sounds, playable instruments & rhythm loops - the ability to combine up to 4 parts - each with level, 2 sends to built in FX with control, Arpeggiator and Filter.
Obviously a tad out of date, but nevertheless certain to find plenty of use.
In that price range that does not exceed $ 5 in continuous "sale" it would not be fair to compare Xpand! 2 with mythological beasts like Dune, Nexus, Omnisphere, etc, but that "mega synths" must get hurt because every minute many patches and sounds of Xpand! 2 are chosen, not infrequently, in place of their own. David vs. Goliath.