I had a Swift 15X-60X telescope once. It had a slight double image when slightly elevated so I sent it back for servicing. Came back great, then it went back to double-image. Oh well, hopefully their rifle scopes are better.
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I have a Swift 18x riflescope mounted on a flat top AR. I've fired about 1000 rounds through it since it's been mounted, and no problems. I don't know alot about scopes, but this one seems to work great for me.
The only thing I have had to do every now and again is clean the film of powder off the muzzle end.