It is WAY cool though. Interchangeable barrels would be a great option.
Cool, but expensive.
In keeping with most of the sentiments above, I would rather have my LCP, with 7 rounds of .380 ACP, and another 6 in a faster loading mag in a second pocket. The concept is cool, but for up close and personal interactions, I still would feel under-gunned with just 2 rounds, and another two with a slow reload.
Put simply, the LCP is smaller, lighter and holds a lot more total firepower than this modern Derringer.
GunBroker has an aluminum one with $500 "buy it now" price.
A titanium one for $780 "buy it now" price.