Crunching the numbers, they'll break appoximately 33% more easily than Mech Inf (between 11% and 52% at the extremes). The ability to garrison means they'll be able to single into range of the enemy in his deployment zone, though. Not healthy for the Storm Troopers, but could be very useful.

The concern I have is that the extra hundred points isn't inconsequential, and in an activation centric meta (and this is widespread) it could tip the scales in the ST's favor despite the difference in durability.

However, no one's stopping you from giving it a shot in freindly games (I mean, aside from your gaming group, potentially). I suspect they'd not be unbalanced, they'd just [potentially] change the dynamic of the SL list in a competative environment in a way that didn't fit the fluff.

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SG

Ghost's Paint Blog, where everything goes that isn't something else.