One reason I have held back on CoQ10 was expense. Plus I felt that the other things I was taking were likely having similar effects.

But it is expensive. I came across a form that purports to be much more absorbable and should be more cost effective-
http://www.jarrow.com/product.php?prodid=438

I don't have any research on it and don't necessarily recommend the product, but the company (Jarrow) has one of the best reputations in the business. One of the few I trust first before I verify. Still owned by the old man who started it and who has a reputation for protecting the quality of his products by forcing any supplier who cuts corners into bankruptcy. Pretty effective quality control

One thing I noticed in the product description is that, at least in this form, CoQ10 seems to be fat soluble. If so it would seem to be important to take it with a lipid, perhaps a shot of fish oil or EFAs. Otherwise a lot of money will be flushed away, so to speak.