Andy_C1- Interesting combo, thanks for trying it out and telling us about it.
I too like the SRP; in many ways I like it better than AIO. SRP/Souveran is my usual combo for the XJS.
I agree it can clog fine pads more than the AIO, I use it with mild polishing pads that still have a little "openness" to them. It's a bit thick for use with Cyclo finishing pads, but I do it anyhow and it works OK as long as I wash/swap the pads partway through.
I tried SRP and AIO side-by-side and found that the AIO cleaned most stuff off a *lot* better (especially dried polish residue). The SRP seemed to work as well as the AIO on tar, though. Ease of use is sorta a toss-up, they're both so easy (for me at least) that it's hard to choose between them. I somehow like working with the SRP better though. I've never had any problems with the little bit of abrasive in the SRP, even on the Jag's soft lacquer. Doing multiple passes with the SRP never results in paint transfer after the first pass.
There's a debatable issue regarding layering SRP. Yeah, it has cleaners and abrasives so it "shouldn't layer". But if you put a second "application" on *very gently* it seems to last a good bit longer than using only one.