@stibin,
I’ve heard a number of tube DACs and they can range from just okay to superb, same exact experience with transistor DACs. The sound quality will be determined by the talent of the builder, design, part quality, attention to detail and implementation.
Musical Paradise has earned a good word of mouth reputation. I would seek clarification in regard to the return policy. If you find it satisfactory I’d get it and judge it based on its sound quality in your system. This the only way to really sort it out. The general dismissal of a DAC with with tube output stage seems illogical and without merit. Execution of the product is the key.
Charles