Comments back:
Shortstop: It's noticeable on the client side, the enemy wont notice it. But it does let you give four shots on a pretty much stationary target. Note, it only seems to work at a certain range, like the FaN.
Milk: I never liked the pistol, so this is a good addition. It makes me miss the bonk or the crits at times, but that depends on the map and team.
Fish: I use the sandman so this is pretty pointless to me. If you're a regular bat guy, however go for the fish!
Powerjack: +75 hp. Some pro pyros I know in the server I go to are using it now. It's insane. The worst part is knowing that not only you died, but gave them 75 hp.
Box: Good when there are no medics around, but that's pretty much it.
Backup: Good when there are medics around. (Or you're good with the box). The bonus is pretty good when the team is facing a sentry or a bottleneck. Note that the buff banner is worthless against sentries.
GRU: I've seen melee heavies going nuts with the KGB, like punch and switch to full crit minigun/shottie. But considering the heavy is the only slow class that didn't have a movement bonus of some sort, it's good they added it. It feels pretty balanced as well, the damage to get somewhere is similar to what a soldier would waste.
Sleeper: Before they 'fixed it' it was pretty darn good. The shots were piercing and they got random crits... Now it's a weapon for newb snipers who cannot headshot. So pretty worthless. It would be worth something if you could jarate with an uncharged shot.
Shield: Yeah, I think the point of the sniper shield was just to get people to stop whining about how come a shield only blocks backstabs but does nothing else... annnnd... to complete the no-headshot set. I don't use it anyway, I don't have the set. I'd rather have a jarate or the smg.
Bush: Don't have it, but I'd rather have the bleed effect. The only reason is that it makes me happy. =p
Fancy knife: Meh. Some people are good with it... I'm not... I'd probably use it to complete the set, if I had the hat.
New spy gun: I normally go gun crazy with the spy and the worst part isn't the less damage. It's the range and accuracy of this weapon. You cannot snipe with it. At a certain range, it simply wont hit anything and the damage curve is horrible. It's only worth it if you go up close and personal with enemies to charge your c&d/dr.
Vita: Wtf, throw it away. Btw, the 20% is of what you have, not 20% uber. If you have 50% uber, you get 10% back on the next life.