I can't comment on synergy as I have never used it, but I have used the Fuzion, which I can't imagine that the two are much different. Perhaps same product in a different container. In any scenario, fuzion was as easy to apply as Wolfgang Deep Gloss Sealant and as easy to remove as Wolfgang Deep Gloss sealant. The key here is "thin". Apply WGDGS too thick and you will struggle... same with fuzion, I'd imagine same for synergy.
My observations on a jet black car :buffing:
WGDGS + Fuzion, the fuzion actually took some gloss away but made it appear deeper. Mind you it's minimal, but it did. Also, took some of the sleekness off. I tried Fuzion one one panel and WGDGS on one, I like the WGDGS look better plus it feels super duper uper slick.
Did an experiment with Callonite #915 on top of WGDGS and found similar results, the #915 took some of the gloss away, but did make it appear deeper. Took more of the sleekness off compared to the fuzion. Also, panels topped with wax over WGDGS seemed to attract more dust.
My conclusion... sealant for glossy and wet look. Sealant make surface sleeeeek. Sealant to keep car clean longer. Wax for depth.
Conclusion #2... I'm a sealant guy, wont waste money on waxes.

rops: :drool:
Conclusion #3... callonite #915 applied thin stands up to fuzion in terms of appearance but fuzion is more forgiving.
To the OP, if you can't see the difference, dont waste your money. I can notice a difference, but it's so minimal that I dont see the point.
p.s. on white, sealant all the way, wax is just pure waste of money imho