For anxiety, I'm only on Klonopin (or more accurately a generic -- clonazepam). For the last few years I've taken .5 mgs in the morning and another .5 mgs at night. It's a low dose.
Do they make me feel normal again? Well to be honest not really. They're part of the equation, though.
Do I feel like I need it? Honestly, yes. I think if I were to taper off I'd probably end up back on it or maybe on something else at some point. Not sure about that and don't really want to try for the time being.
As for side effects I don't have any. Well, I cannot drink. It magnifies the effect of alcohol quite a bit, and I don't drink beer. I've always been a whiskey/bourbon man so if I do drink it's only in extreme moderation. On rare occasions I have gotten carried away and that wasn't good at all. Some people get tired when they're on Klonopin but I was only that way when I first started taking it, and it wasn't that bad even then. Within a few days I actually had more energy because I felt a lot less burdened.
Klonopin has a drawback...dependence. You can't just stop taking it or you will have some pretty bad withdrawal. You have to taper off of it and it's a slow process. That's not really a side-effect but it's worth mentioning.
Zoloft is primarily an antidepressant. My mom has been alternating between it and Prozac for years, having a lot of time off in between. I guess some people are fine like that. I had another friend who used Paxil for anxiety and was off of that for a couple years before going back to it. He seemed fine to me for most of that time, and I could tell when he started needing it again. I'm guessing this is normal for a lot of people. Everyone is different.