If you're going to use an electrolytic for coupling, it's best to use a non-polar cap. Though e-lytics as coupling caps are not politically correct, a lot of high-end designs (from people like Bongiorno and Pass) have used them.
Basicaly as long as it doesn't make no sound when I power it up I'll be happy, quite a few components I will still have to replace with better ones from online sources as time goes by... things like this are not cheap here