I'm considering buying a 7-string guitar. Is this a wise choice? I've been playing a couple of years and think I could get used to the wider neck, but is there anything about them I should know? Are they much more difficult to play? Is it still the same playing songs that would normally be played on a 6-string, just there is an extra string to worry about? I mean you can ignore the string if you like, right? And are the strings actually any closer together on a 7-string, because I have rather thick fingers.