Both Helicarriers (SDCC and retail) look like overpriced hunks of plastic. I see nothing fun about them. They are more-or-less undersized runway play sets on which to display figures. I had considered getting the Avengers version if I saw it at a deep discount, but these two pics have changed my mind:
This one just drove home the hilarity of the size.

And this is the skeletal appearance of the underside. I would have hung the Helicarrier from the ceiling if I got one, but there is no way I would want the underbelly to be seen.