I had one, loved it. They do feel heavier than a Phazer, but more stable/corner better because of the wider front end. That sled surprised many people with the top end that it had. Make sure to check the heat exchanger underneath that sits in the center, right in front of the track. Very notorious for these being ripped off. I actually removed mine and coupled the hoses together, never had over-heating issues.
To answer your question about the Phazer vs '93 Exciter sx:
My cousin had a '91 Phazer 11, Aaen pipe, comet clutch, flat-slides, port & polish. My Exciter would pull him off the line hard about three lengths, he would then stay three lengths back until we got around 60-65, I would then start pulling away from him hard to top end. Top end on Exciter was quite a bit more than his Phazer. This was both with 3/4 aggressor track. He then put on a 1-3/16th track. He could then pull me off the line about two lengths until 60-65, at which point I would reel him in and then pass him. I always figured if I had put on a 1-3/16th track and set up the gearing and clutch for it, would have been a very nice gain. It would lose some top end, but would pull harder through bottom and mid.