Salvia is worth it if you don't mind not having any fun.
No, seriously, I mean that. Salvia is an extremely powerful experience and therefore has a lot of potential value, but it is certainly not a "fun" experience and it really can't be taken in a "recreational" way. It's just too weird to be enjoyed the same way you would enjoy pretty much any other drug.
I personally had the most intensely negative psychedelic experience of my life the last time I used salvia. It would be impossible to accurately describe it in any kind of close detail ... while I remember it quite clearly there really isn't a vocabulary for what it was like and I'd end up using words that would completely fail to offer a correct picture. But in general, I think it would be right to say that I've never been more uncomfortable in my life, although I don't know if that applies to physical comfort, emotional comfort, or both (which is a weird feeling in and of itself). I can say that while it was exceedingly interesting, there was nothing enjoyable about it at all.
I've known people who have had experiences on salvia of equal intensity that they approved of. One friend of mine told me he had crawled to the border of the universe, looked outside, and crawled back, and he was pretty happy about it overall. But he didn't describe it as "fun." He just said he was glad it happened. Basically, it's a crazy ridiculous trip of unheard-of intensity for about 5-10 minutes and it is completely unlike any kind of drug you have ever experienced. It's completely uncontrollable and you're at its mercy for the short time that you're on it.
It's important to note that the above is only true if you take a big enough dose to give you an out-of-body experience. The last time I took it was the only time it did anything like what I just spent three paragraphs talking about, and that was after 3 previous experiences in which it just gave me giggles and a headache, and some faint closed-eye visuals once. The one time I took a strong dose, though, I was tripping for 5 minutes completely elsewhere, with no connection to my physical body whatsoever. What my friends told me was that it had been 5 minutes between when I started tripping and when I did the first thing I did after coming back (which was get up and walk out of the room as if on autopilot, realize halfway down the hall that I was tripping, and walk back into the room and sit down murmuring things for a little while). I didn't believe them at all, but apparently I was even sitting up and laying back down again at points while I'd been in whatever kind of trance state I was in. It wasn't a blackout because I remember what happened in between, but what happened in between lasted about 30 seconds (to me) and was a completely different state of being.
A smoked salvia experience will really only be noticeable if you smoke it extracted and concentrated. 5X is usually the lowest concentration offered and will probably only send you into something crazy if you really try to smoke a lot of it. I did that with 10X the time it kicked my ass. I've seen it sold at 20X and heard of 40X, although to me that just sounds useless because once you get past a certain point it really does just black you out and give you a REALLY weird wakeup. Go for it if your curiosity is enough ... it was for me and I'm not sorry I went for it. But don't be surprised if it gives you a lot of good reasons to stop there.