I've always liked the Tempest. Seems like a well-designed mech, if a bit short-ranged in focus (oh, for one that swaps the LPL for an ERPPC, like a FWL-flavored Falconer!).
Aesthetically, it reminds me of the Guillotine, especially in the flared shoulders, cleft feet, and the way the head sits between the shoulders, below...a thing (spotlight for the Guillotine, ML for the Tempest). The armament is different, but not completely unlike the GLT; SRM6 is still there, collection of mediums, etc. I wonder if there's any relationship there.
Capability wise, it fits neatly into a slot with several others of similar tonnage and armament. I'm thinking here of the Cestus, Jinggau, Helios, etc: low-end heavies with a gauss rifle as primary armament. Obviously there are differences; the Jinggau is 5/8/5, the Cestus doesn't jump and has better mid-range guns, the Helios has an SFE and bad armor, etc. But generally speaking they're solid, reasonably dependable heavy troopers.