My personal opinion: I've tried/felt Waverly open-back tuners and was not at all impressed. Folks who love these dig the "traditional" look and old-school vibe of vintage acoustics, and these are very light. But as for function, they are really just "ok." Contrast this to the Gotoh referenced above and I personally find no comparison: the Gotoh 510 is the smoothest-turning machine head I have ever laid hands on.
But even more, it has no "gear lash" that I can perceive, meaning every little micro adjustment you apply to the key gets directly translated to a precise micro adjustment on the string post. It is the
only tuner I have ever come across (over innumerable acoustics/electrics I've played over years) that I am confident enough in being able to tune
down to pitch (which obviously one should always tune
up to pitch). I have 510s that are 1:18 ratio that are
this precise; and my 510s with 1:21 ratio are even more precise. FWIW, I "discovered" these 510s some time ago as a skeptic. Afterall, how good can a machine head be fer cryin out loud?!! Then got my first set on a whim ...and proceeded to put two more sets on other guits. All IMHO, mind you, but I find they are well worth the money and effort even when the stock Taylors are working 100%; but if you have to replace, the 510 is a no-brainer!

And yes, if you can weild a drill, tape measure, and screwdriver with a modicum of skill, installation is easy peasy!
Edward