Recently I played a gig where I needed that low D, just for one song section. So I ordered myself the D-Tuner to go on my old Warwick, set it up in no time and after a little tweak, got it bang in tune. Worked perfectly!
I also play in a band where half of the songs are in drop D, no more faffing about tuning after each song! It's great. Well built, accurate, reliable and easy to fit and use.