are they good to go? ive heard mixed reviews on them, some folks say they are great, others say they have had issues. they dont take AMEX which makes me worry, because amex offers ME protection while visa gives me a big woody unlubed if i run into vendor issues... i am leary about buying from them. i am looking at getting 1 svd center mount scope mount and 1 ak style scope mount. i mean, its not thousands... but i dont want to be out 150 bucks.