yep i have a  Winchester set i carry in my shoot box . 
 While the bits are  precision  bits , they are rather soft and can be twisted , especially the smaller ones .
Also  I found that some of the standard  slot bits  are not that precision . The  handle has a press fit ¼ in ,chuck that the bits fit into and  that gets lose rather quick .
 The  handle is also hollow so as to hold bits ?? Why I don’t know as no  gunsmith I know dumps their tools  in there . The hollow handle has a cheep , thin plastic  screw on cap like something found in the dollar bin. Mine Kept backing off . I finaly super glued it  so  I wouldn’t lose it . 
  Frankly its not a very good set . But for most muzzle loading  needs , it will work just fine . Past that though and you will need to be real careful so you don’t bugger up  what your working on . but it is alot better then trying to use a standard screw driver . That being said , I have had mine for probably ???12-15 years .
 For in the shop , I have an old set of wood handled  Forster   and Grace drivers .  
 My most recent set I bought a few years ago  from Brownells . It’s a Megna -Tip and I really like it .
 While  it doesn’t have the feel of the Grace drives , it does have a good tight lock up . It does come with a basic bit set  which you then can add  to  if you find you need a specialty size . That saves you from paying 100.00+ for a good full set , when you only need 5-10  different slot heads  for most common jobs 
As to a recommendation , I would recommend the Megna- tip .
  It will cost you a little more , around 30-40.00 when on sale .
However  if you ever actually need a good gunsmith driver, you will have the right tool and if you strip out a screw head or  slip and gouge a engraved sideplate , you wont be able to blaim anyone but yourself .