I've been using an IMI-108 mini for 10 years now. I have round port heads, and the bulky factory Delco starter simply wouldn't fit with 1-7/8" primary header tubes. I switched to the 3" RAIV manifolds last year, and I still had to re-clock the IMI mini starter.
Obviously, there is a need for a mini-starter in the Pontiac world. I don't think people buy them for the "bling" factor.
Not only does the IMI-108 mini starter start my car under any conditions, but it's half the weight of a Delco starter. I have a trunk mount 1000 amp Delco battery, 2 gauge to the starter, 0 gauge to a back bumper bolt.