Of the doubles I have personally held, and the pictures I've seen, Holland's offerings are generally back seat in asthetics. Of the fact that I will be be spending a serious amount of money for a double, I look at Holland & Holland in a different light. The same light I look at when I buy a coin. Is it a sound investment? My personal preference for asthetics flows very nicely with a double I've come across on the web many times in my search for envious eye candy.
Gorgeous (IMO) Double

Very little embleshment, gorgeous color case hardening, nice wood work, in the big traditional one. If my gun is to have engraving all over it, I will make sure its in scroll work. Scroll work like this is what I prefer:

Not a double, but a Hartmann and Weiss Mauser is still nice

(Edit) Make no mistake, either, I am not looking at a double as just an investment. I will most definately use it. I would also like it to retain/increase its value in the event that I have ever have children, so that they may end up with something unique, collectable, and personal. Not so far removed as the pair of Pre-64 Winchesters (.30-06 & .375 H&H Belted)that I posess, initially bought by my grandfather, and passed down.