Arimas are known for handling seas very well because they're "corky" (big beam, not so much chine, foam filled (and unsinkable)
With all that beam and limited chine, however, they do tend to pound in chop. But once you own one for awhile, you figure out how to get along with those characteristics.
With my 19 footer, I always kept my bow-tank (10 gal of water) full. I also stacked some full gallon water bottles up in the forepeak to keep the nose down.
With the new 21 footer, it came with trim tabs and I only wish I had put those on the 19 footer instead of messing with water bottles---trim tabs are a really nice piece of equipment on a "corky" boat like an Arima!
As far as value, yes, they're spendy, but there are several 19's and 21's on Craigslist that as far as I can tell, are stone-cold bargains. This is a great time to buy an Arima! Off the floor, with power and trailer and all the bells and whistles, a 19 to 21 foot Arima will cost 50 - 70 K.
These days on CL, you can get the same rigs with 100 - 200 hours of use on them for 35 - 40 K (with silver or blue hanging off the stern).
That's still a lot of money, but it's a safe, sturdy boat that requires minimal upkeep and will last a lifetime
BTW, the further you go down the I-5, the cheaper they get. I saw a 22 foot Arima last year with trailer being offered at 35 K. All I had to do was drive to San Francisco to get her. It didn't last long at that price. I still see them offered out of California at rock-bottom prices. Not sure why; probably more competitive market for used boats down there (and greater economic pain??)