I’ve combined XiSt with A314 and I would say that XiSt is much better on its own – yes, XiSt does lack a hard hitting punch but that’s how the product was designed. It can work slowly, but the results WILL come even if there is only a slight “spark”.
I’ve written a review on XiSt (pheromonexs) on my site which is far more in depth.
(admin note: I extracted the link provided by phertest. It was reported as a backdoor advertising link for competitor product which is against our forum rule on commercial speech – “Commercial speech limitations: 1) If you are commercially involved in any manner (directly or indirectly) with pheromone related technologies, you must make arrangements with management before participating on this site in any fashion.” Please be warned. 
– herepero)
Since I wrote that review, my girlfriend and I broke up. At one point after a huge argument, she mentioned she wanted to get back with me but couldn’t because of all the fighting. Coincidentally, this was around the time I wore XiSt around her a few times.
Keep in mind I was not intending to get back with her, this was purely experimental to see if she would stop acting immature regarding the whole situation. I would have liked to remain friends, but she kept a bratty attitude even after I was over it which tore us apart.
P.S. Also, she is 19 - a314 is too mature and serious for girls this age. XiSt is a much better option depending on the type of girls you go for.