It's a very good expansion, but it's a shame that it's based on the original Shadow Tactics instead of Desperados 3 and thus lacks things like the tactical pause and mission recaps. It's pretty much just "more the same" when it's been 5 years and the original was already good, I don't mind at all.

Personally I'd prefer the missions to be about half as long as they are (~2 hours each), but I guess it was to be expected from an expansion. Desperados 3 is still the king of tactical stealth, and I think the next step is to scale the missions down to be less time consuming.