Out of interest, is this a general problem with smaller helicopters?
Is lack of luggage space a general problem? Yes. I can't think of any small (ie 2 or 3 seater) helicopters that really have any.
Or, do you mean the related, and in my view more serious problem, of using under the seats in the R22 to store stuff? The seats are designed to collapse in the event of a hard/crash landing, but it you put things underneath....well, you don't need it spelled out, do you?
And is this a problem in other small helicopters? I'm not sure. The Rotorway has no storage space in the cockpit whatsoever, I don't think the Schweizer 300 does, and I'm not that familiar with any others.
So for the R22, I think this helipod is a brilliant idea.