I've had tons of good stuff with options-raise critical hit/evasion, raise hp/mp absorption, additional attack/defense etc-but nobody buys them. Reason?
Noobs want mounted!!!
If you wear mounted-you are actually wearing something u shudn't be-because your str/dex is still not upto scratch. And I personally feel it's a waste of money paying the extra premium for mounting-especially when theres nothing else redeemable about the item.
I've been asked for mounted G7...by level 5x archers!! WTF do u want mounted G7 for? Why can't you be content with a decent G5 suited to your level, with good options on it?
If it were upto them, they'd want 2000% mounted Petra armor (G10 bow archer), so that they can strut around town with it!

Bottomline-Mounting is fine...but don't make it a single handed obsession. Be patient and lvl up to the required amount before wearing stuff.
That being said, I'm using a 10% mounted G7 bow (which was loaned to me by the way)-and in another 3 levels I will anyway qualify for G7.
I have the full G7 set-all unmounted, all with great options on them.