It may have its uses, but, IMO, you can safely stay away from the wobble
variety for most of your woodworking tasks.
Freud, Forrest and Amana make some of the best stacked dado sets, which
consist of two outside blades of even thickness, and varying thickness
'cutters' and 'spacer's, sandwiched in between preciseness in setting the
width of the dado.
You can buy cheaper brands, and they will work fine, but you generally get
what you pay for in quality and long lasting sharpness.
An 8" stacked set is desirable for an increased depth of cut, depending upon
your table saw, but for most dadoes a 6" will also work, and may generally
be a bit cheaper ... again, your saw may have something to say about this.
Basically, if you are a serious woodworker, get a carbide tipped, 8" set of
the highest quality you can afford and you won't go wrong.
One thing to consider in a stacked dado set is whether it will give you a
flat bottomed dado ... many give a flat bottomed dado, but with "bat ears"
in the bottom corners. These can be unattractive on a visible, through dado
and bug some folks, so ask around.
I use an 8" Amana set I've had for a few years and it has cut a lot of
dadoes, and hasn't needed sharpening yet ... it does exhibit slight "bat
ears", but has never posed a problem for my way of working. What I don't
like about it in particular are the plastic shims that come with it, but
they can be replaced with other types quite easily.
Last update: 12/29/03
Click to see the full signature.