1st and foremost,

and Welcome to THE Forum!
Kinda depends on which "Uberti" sight you're thinkin' of! If it's this one available from Cimarron:

It's more in line with the Lyman & Marbles. What I don't know, is whether it is windage adjustable like the Marbles, or fixed windage like the Lyman. The description o the Uberti site isn't very forthcoming. It looks very much like a sight I have on my mdl 94 Winchester, which is windage adjustable. Mine also has a nice set screw in the front part of the base, for making sure the staff is vertical... and not leaned fore or aft; which makes the aperture hole elliptical shaped... and will throw off your aim. The Marbles, besides being windage adjustable, has click adjustments... Again, the Uberti description doesn't elaborate.
The fact that it comes with a globe front sight is a nice plus... At least for me... as I like 'em!
Some folks say that a tang sight speeds up their shooting... while others say it slows them down. It really depends on the size of the aperture. A nice small aperture will better center the eye behind the sight, which then increases the precision of your sight picture... and your shooting. However, this also decreases the light available... so in low light situations it makes it harder to see the target. The increased distance from rear sight to front also increases precision.
Using the sight sans the aperture disk is like shooting with a "ghost ring" rear sight. With a good cheek weld to the stock, no head movement, you can really see all around the front sight... these are usually the guys that say a tang sight speeds up their shooting. They don't really SEE the rear sight, it's more like a fuzzy circle they're looking thru, but with a bit of familiarization, their eye automatically centers itself in the rear sight and then all you have to concentrate on is the front sight.