So I've played 5 diff chars to lvl 10, 2 chars to lvl 31, and am now almost 40 on my Powertech.
I love the class, and I love our swirling flames in combat. But overall, when not using flames, we look like boring Mercs.
I don't want us to be dual wielding tanks, or blaster rifle wielding tanks. I want, for at least shield techs, an offhanded shielding animation. The current giant bubble is not very exciting in any way.
I would say some kind of item held in the OH, that when you shield, shows your character projecting a smaller hex like shiled out of the device and absorbing the damage.
The other thing would be to make larger and or different looking blaster pistols for the Powertech family as a whole, just to make it look a bit more threatening and actually different from Mercs.