I'm a big fan of the Stooping Hawk. While not as popular as some other medium weight Onmis, such as the Stormcrow, it's a solid design with solid configurations.
The Prime is the most common in my playgroup, serving mostly as a medium trooper. The Alpha, Charlie, and Delta are run as multi-role flashbulb units.
The Bravo is something of an oddball in my group. Most missile boat Omnimech configurations are only played if the number of dedicated "Fire 'Mechs" are down to critical levels in a campaign. On the other hand. the Stooping Hawk Bravo sees considerable use in the fire support role. Not because it's necessarily the best Omnimech for the job. It just ended up that way. No big deal though, since it functions well in that particular job.
Just my two cents worth.