Win. Super-X was great ammo 15 to 30 years ago when I used it. High quality ammo. I used nothing but Win. Super-X HV 37gr HP and 40gr RN in my semi-auto 22's because it was the most accurate round I could find at the time, and the most cost effective in the 100rd plastic boxes. I have not used it for about 14 years because I got out of rimfire for a a decade or more, so I don't now how it is today, but it was shooting the same as Mini Mags for me back then.
Just be aware that there are 2 kinds of Win. Super-X High Velocity today. The Super-X PowerPoint, and the regular/less expensive Super-X. PowerPoints are supposed to be better and cost $1-$2 more per 100 than those "SuperSpeed" 1300-1330fps. I was lucky to find a box of PowerPoints for $9.95 a few months ago. It shoots just as good or better than Mini Mags in my rifles. It is very consistent. Winchester does not make too many PowerPoints these days so they are hard to find. But the Super-X SuperSpeed 1330fps seem to be much more readily available, especially at Walmart and other big box stores.
I do not shoot bulk pack ammo except for the Federal 745 once in a while, but I do not consider the Winchester bulk packs "Super-X", and they do not advertise them as such. The M22 I shot was pretty average for me, and not as good as the Super-X PowerPoint box I bought recently, so I traded the M22 for other ammo with a friend who was in need of .22LR.
I have said this before as well as many others here. I would not judge ammo too much these days until the ammo situation stabilizes. I think manufacturers are mass producing ammo way too fast to meet the demand, and at the same time have sacrificed QC considerably. I never had any FTF's with ammo I purchased prior to 2013. In 2013 I had several FTF's including CCI Standard Velocity. An entire CCI SV brick was "bad", with 3 or more duds in every other 50 round box. That does not mean I will not purchase CCI SV again. It's just the times we live in. Too much ammo is rolling out the doors not properly checked. It is also being manufactured by new inexperienced employees they hired to keep the machines running and producing ammo at night or 24x7. Case in point the Win. M22 recall and others.
Harry