Anyway, I'm running a marui M&P, shoots like a laser to 200ft out of the box with .25s
Plastic slides are GREAT for gas efficiency. More so when you pair them with a lightweight blowback unit. It also means they'll run to colder temps than pistols with metal slides.
Durability wise, plastic is most often fine. Just stay away from the 5-7.
Hicapas are great due to the incredible amount of aftermarket support for them. But the 226s and M&Ps are also great marui pistols. Well worth the cost.