Making a good SSH client for touchscreen devices is hard. Touchscreen devices have limited screen real estate and non-standard (read: limited) keyboards.

As to the language: Clean and crisp say both pretty much the same thing in that sentence, crisp is only along for the alliteration (as is cheerful). My Latin teacher would be delighted.

It's marketing, but it also makes sense. Not all apps are created equal, even if they all do the same simple thing, especially on touchscreen devices. It's more about selling you the keyboard (a suitable keyboard for SSH clients doesn't come standard with touchscreen devices) than about selling you the client.

Oh, and why do they include a description of the target group? Maybe because some people read the Panic blog without knowing what the hell SSH is? Those Panic guys are are pretty well known.