Depends on how often you switch weapons. If you're like me and usually only switch when on last mag or hear the dreadful, "Click click click." Then a speed sling isn't usually worth it.
But if you often use one weapon for short range engagements, like a SMG but a AR for long ranges, then the ability to quickly switch back and forth is much more potent.
Anyways, for your question, I don't think it's worth it to have it on either. You should maximize both weapon capabilities and just stay mindful of your ammo limit, cover, and your battle effectiveness in certain scenarios.
I switch my weapons regularly and often in battle, it's faster to switch weapons than reload and this is really the only game I've ever taken that into consideration.
That being said, the decreased time in weapon switching (especially TO my shotgun with the SS) is a life saver. I almost never shoot unless I know I'll land my shots, so I don't waste anything usually.
The speed sling is definitely something you have to LEARN to use, it won't show you any initial benefits unless you can master it quickly.
I dont see much of a benefit or a penalty either way.
I'd rather use foregrip on my bulpdaun and the pistol is fast enough as is.
Bulpdaun doesn't need the grip, it has extremely high stability and the difference is negligible. I'd rather have the SS on a weapon on that (grip on something like the Tampa) because it insures I'll have it out the SECOND I need it.
I believe that there was a rumor a long time ago stating that speed holster acted as a grip as well. If that's not true, then don't even worry about it. That slight difference in switching weapons isn't as good as getting more shots in. Brink community even on PC is small. Most of these guys would get ran through against the top 360 players.
It doesn't act as a grip, hence why you suffer a minimal loss of stability. It makes little to know difference.
Both the grip AND the SS offers basically nothing but benefits to your weapon, the negative aspects affect the weapon's use in almost no way what-so-ever. It largely depends on your play style.
And what does the bold have ANYTHING to do with ANYTHING?
That's just arrogant and ignorant. We could never prove to anyone who has the best community and I'm sure there are tons of skilled players on the PC, PS3 AND 360 of varying degrees of ability.
Your arrogance is ceaseless. Please stop making the rest of the 360 community look bad and, instead, speak for yourself.