I picked up a Huffer today, and have a ward of warning regarding Caliburst...

In moving from his packaged robot mode to 'vehicle weapon' mode.... on the first step no less, i snapped his head right off. The instructions certainly seem to indicate that his arms (when folded in) should be parallel to one another.. but it's clear afterwards that they should not be pushed in all the way since his head is sitting too far forward and hindering the arms.

Otherwise... While Huffer looks good in both modes, his transformation is too basic for this size (comparing to recent scouts). That said, i quite like the combiner head for regular mode, since folding down the smaller head fills the chest void. You can detach the gun part of caliburst, and attach it to Huffers arm, while using the rest of caliburst as the chest piece, which looks pretty cool.