I love my Masada. FPS out of the box was a disappointing 280
That's because the airseal is not too great, fix that and you are good for compression.
Also the hop up unit is plastic an proprietary, so if it breaks good luck getting a new one.
The externals are by far the best part of this gun, very solidly build and suprisingly good finish.
I purchased a metal hop up from Evike but the unit is not complete, you still need to use some of the parts from the stock hop up, so its not a great solution.
I was pleased with the stock accuracy, but it wasn't anything to get excited about.
If you have the money to buy the Magpul version I would suggest it over the A&K for no other reason than you can actually find replacement parts for it. But the Magpul version has its own set of issues as well.
If you have any more specific questions ask away or shoot me a pm.