Rather like the SGR despite it's XL engine though I do imagine you could 'downgrade' to a light by dropping the rearfiring lasers. If you wanted, you use the freed up space to give it TSM, make it an even nastier urban brawler with one hell of a kick. Yes, the 10X does the engine swap, but loses most of its punch in the process, and relies on blakist salvage.
As for the canon variants, I hadn't seen them before. According to Sarna's posting of them, the 9D gives the risk of ammunition, but the C3 rig puts it in a decent position to stay at range now that it has more guns that can hit from longer than 10 hexes away, and I've always had a fondness for LB-X ACs. The 10X version, however... I don't want to like it because of it packing Blaketech, but the mobility and Light engine are keeping me from dismissing it out of hand. The Light PPCs are kinda dubious in comparison to the reach out and slap you of the ER PPC, but quad MVSPLs, despite giving me the crawls of FanaTech, are a case of some serious hurting up close, which the 5 IJJ could get you in short order.