I rather like the Hermes II. The original is a solid scout that trades speed for armor, and a main gun with above-average accuracy at what would traditionally be medium range at the time. (Translation: Fight at 4-12 hexes when possible, so that most other scouts will have medium and long range shots, while yours are at medium or short.) The Mercury is just sublime, and only its rarity leads me to recommend using it as a headhunter instead of your default scout. The -4K isn't one of ours, but I wish it was. Two large lasers on a fast chassis, that can keep heat under control with a 2-1-2-0 firing pattern? I'm sold!
The 3050 model is a disappointment to some, but I like it. Unlike some other mechs from that era, it's a solid upgrade that enhances the existing capabilities, without compromising it with too many new toys. I'm not a fan of the Mercury Elite, but can see how it'd be used like the original, using the LGR's improved range bands to get superior range mods closer in, as opposed to sniping from far out. I truly wish the -5C were still around, that thing's just beautiful. Gonna be the backbone of my medium forces the next time I pay a WoB force.
Finally, we get to the -5Sr. Perfection, utter perfection. Between this and the Cicada-3P, post-Jihad medium FWLM forces must be an utter nightmare to face.
As for the Sirocco, I love it. There's a member of my local gaming group who fears them, simply because one time he faced them, they proved nigh-impossible to kill.