Value Ram will work fine in the average computer. But as Yogi Berra once said, you can observe a lot just by watching.
Value Ram memory modules vary a great deal from month to month and year to year. They are of a unique design intended to make use of "binned" chips that have not been tested. Value Ram is not thoroughly tested, so the user becomes the tester. If it fails, the user is given a replacement, usually without argument.
There are details on this second and third tier memory in Scott Muellar's excellent book, Upgrading and Repairing PC's. Also, there have been very good memory reviews which included Value Ram on the anandtech and tomshardware websites.
Value Ram has performance issues when challenged in a high performance system.
When using a desktop for routing functions, we never see any problems with ValueRam. But when used in computers/motherboards with overclocking and other high speed or high heat uses such as gaming or graphic design work, Value Ram suffers badly.
We put value ram in our customer's computers, and give them the same warranty, although the price differs. But we advise them of the performance differences.
Value Ram is not for everybody, but there are significant cost savings for those who do use it. We do not recommend value ram for any high speed activity such as gaming or Adobe Creative Suite work because the differences are usually noticable.
When you look at a bag of Value Ram, whether by the same or different manufacturer, you will see many different sizes and shapes. There is a clear lack of consistency in manufacture if you look at enough modules.