Over the last 4 decades I have used the Japanese-manufactured Tasco's on everything from .22 Magnum up to 338. Win Mag. ; in rain as well as sub-zero temperatures, not to mention being bounced around in the cab of a pick-up truck, and have had no problems with any of them. I currently have four of them on various rifles. As for the Chinese-manufactured Tasco's, I've only ever used two. Optical clarity sure isn't the best, but they have (so far) held their zero. I currently have one of these Chinese jobs in 4X on a NEF Handi-Rifle barrel in .357 Magnum.
Over the years I have used and currently own Bushnell, Burris, Redfield, Weaver (El Paso & post El Paso), Simmons, Tasco, and the "much vaunted" Leupold. I only ever had problems with three; I had the entire rear lense assembly in the eyepiece of a Weaver K-4 actually drop out of the eyepiece housing, and a K-6 (all steel model) that fogged up. I trashed the K-4, but sent back the K-6 for repair. I also had to send a Leupold back three times; this one got so ugly that a post I made on Savageshooters.com and gunsandgame.com about this one was immediately deleted by the site administators, so I won't go into that one here.
The point of all of this is that it's all pretty much a crap-shoot. All of us who post here can tell you of our experiences, but the only way you're really going to know is to buy the scope of your choice and put it through its paces yourself.
Red