I've owned lots of Turks. Some gems some lemons.
Corwin single shots always served me well, I've had 3 seperate models in the 3 popular gauges. I had a warrior lever that would not cycle without extreme force, traded it in for a semi auto asena that stopped working the second time I used it. Replace some parts and it functions flawlessly for literally 1000's of rounds, great gun, no break in necessary, hard to believe it was less than 400 bucks.
Corwin always seems to back their product at least, but don't expect a super high end firearm from Turkish manufacturers no matter what the fan boys say. Generally the fit and finish on the Corwin guns is VG, especially when you take the price into account. My recent 20 gauge has a gouge in it, but I know they will make it right and quickly from my past experience with them, more than you can say of some name brand manufacturers.
I had a mossberg side by side from Turkey. I liked the gun, I had always wanted a single trigger side by side with removable chokes. I shot it a whole bunch, I was really into sporting clays and rabbit hunting in those days. After around 800 rounds a piece of solder on the front of the top rib came out, it still functioned but I did not like that at all. I returned it to the warranty department (think it was Gagnon Sports? Don't quote me on that one) and it took almost 6 months to repair the thing, the store I purchased it from came through and gave me a new one after a while. Same problem after approx 100-200 rounds (one good day of clay busting). I was so pissed I could have spit, hawked it off at a local gunstore for much less than I paid for it. Left a sour taste in my mouth for sure.
If you buy Turkish do it from an honourable supplier like Corwin is the moral of the story I suppose. They're a good way for young guys like me to try a variety of actions, and honestly guns like the Asena and pa-08 clones are on par or well above the quality of domestically produced budget shotguns in my experience.