I've been thinkin of upgrading my timing light as well. After some research, I've chosen the same one that Dan has.

Heard nothing butt 'terrible' things about dial-back timing lights.
  Most complaints are they are NOT accurate. The very thing you NEED a timing light to be!
My recommendation!........ stick with the timing tape (or a graduated dampner) and an old school/cheap/simple timing light with a decently bright light.
jus say'in
6sal6

I've heard the same thing Sal. Thought it applied to the older ones with a dial ... not the new digital ones.
Could be wrong butt.

I have one of the Innova's and a good old fashioned one. Both give same results on basic timing. The digital is sweet though because it makes re-curving a distributor real easy. 

FYI...Amazon had it listed as 5568 Pro Timing light back in 2015.
Didn’t have the “a” at end.

Perhaps it is the yooper model..eh?

So I recurved the distributor today using my new Innova 5568 timing light.  I don't know how long it'll hold up, but it's a very nice light.  Simple to use and the dial back feature is very handy.  My Duraspark has the 13L slots, which provides 26 crankshaft degrees.  Combined with my desired 12 degrees initial advance, that resulted in 38 total mechanical advance degrees, which was a little more than I wanted.  So instead of pulling the shaft and welding up the slot, I put three layers of shrink tube over the advance limiter post.  This reduced the advance by 2 degrees.  I also changed both springs to the black (lightest) springs in the Mr Gasket 927G kit.  That still resulted in total advance coming in at 3,500 rpms, so I bent both post a bit until total advance came in at about 2,900 rpms. 

I purchased the Innova online and it was dead out of the box so I bought a Bosch and it seems to work well.  Good luck with your project.