I also own a NOVA. I love it. Its a solid pump gun. It feeds and ejects all three main shell sizes JUST fine. It bucks like a mule on the 3.5" rounds though. Then again, almost ANY pump gun will...nothing new there.
My Nova also has a tube extension, ghost ring sights, and tactical sling. The gun is accurate out to 100 yards with the sights, using slugs and sabot.
My other shotgun that I shoot is a stock Remington 870. My bird gun.
And then, these three are in my collection.
A Winchester Repeating Arms 12 ga. Model 1887, number 4740 out the roughly 16 000 manufactured.
Below that is a damascus double barrel pre-1880 12 ga. with etching and woodwork...slightly used, slight patina. Custom work...
Last is a reproduction late 1800s Remignton pump 12 ga, produced in 1908 possibly earlier. Worth little but in great condition.
Merkel is the the low end of the rifles and shotguns they now distribute. Including if I am reading everything correctly, Grulla, and Johannsen. The last two companies are big time custom gun makers. Merkel does too, they just run about 12K a gun rather than 16K. Merkel's sales were about 150 million USD, mainly to Europe, just to give you an idea.
Their largest sales are in double barrel (usually over/under guns) shotguns.