I really hope you're ready to do some serious homework before flying the PMDG 737, it's one of the most advanced addons out there (along with SSW A310), and not the "load and fly" kind of type of aircraft

I like PMDGs 737, it gives the simulator a whole new dimension...just to start the engines is a challenge for beginners.
FMC is nice, although not 100% functional, but very close. You need to master this to fully benefit the many features. But most users will learn it in just some days.
IRS is not functional, which is kinda sad. It's beyond me why PMDG refused to include one of the most important systems of the aircraft....
VC is superb, but requires a fast CPU. All knobs and buttons are clickable I think

2d panels looks very nice, the LCD screens are clear and easy to read, you canm choose their update rate if you're sitting ona lower end machine.
The model is stunning from the outside, will make you drool for several minutes, but it's of course an FPS hog aswell.
But what I like the most is: The aircraft flies like a dream. So smooth and precise, makes every approach a walk in the park.
I've had the aricraft since day one, and it's the best payware aircraft currently on the market - at least if you strive for realism and quality

Oh and one more thing...PMDG is far ahead of Eaglesoft when it comes to realism and complexity...their CitationX is not in the same ballpark.