Haven't had any problems yet *knocks on wood*. I didn't have problems when I had them horizontally, so I didn't expect to have any now...
Thanks for the compliment on my tail...I get a few remarks from people wanting to see what it is and stuff, but everyone that's seen it has really liked it. I've been told I should get it in a magazine or something, that it's that the coolest/most origional/bad-ass tattoo...etc...I'm very proud of it, anyway.