I can’t provide a helpful review for that specific request, because searching for or using “Ulead Video Studio 10 with a serial key” typically involves copyright infringement. Software serial keys shared online without purchase are usually pirated, and using them is illegal and risky (malware, data theft, lack of updates).
However, I can offer a general, helpful review of Ulead Video Studio 10 (legitimate version) for anyone considering older video editing software: