i have to admit that i have embarked on a seconde and parallel endeavour recently, that is to find a syngut that replicates the feel and touch added by a good multi (midprice range) to a hybrid stringbed with poly mains.
while i have in the mean time an entire collection of syngut sets waiting to be strung up, i have in former times played with syngut (rarely full bed but more often as cross-string) but have not really kept any records on the way they played.
from what i remember and has so far been confirmed by my first syngut tests:
feel - most multis, there are very few exceptions, provide a lot more feel than synguts, even expensive synguts. any touch shot and in most of the cases slices are much better felt and hence controlled by stringbeds with multis.
power - the multis seem to vary much more in this respect, in the sense that the lowest powered multi is quite a bit below the lowest powered syngut and this holds true also for the highpowered ones, which exceed the synguts. this implies nevertheless, that synguts in general are providing for some better control, while multis do vary quite a lot in this respect. that means that if you are a topspin-power player for instance, not very many multis will give you really good consistency, the higher powered ones tending to give you issues with spraying the balls quite a bit around your target.
spin - since synguts usually are somewhat stiffer than quite a lot of the multis they basically give you better acces to spin, provided you string at the same tension. from my experience though, stringing about 1-2 lbs lower for synguts than multis renders the same results in terms of spin in most of the cases. i have not tried so far any shaped multis, as according to my experience so far, using them in the crosses would not be of any benefit at all (but i might be wrong - i have the dunlop hexyfibre - a multi - on my wish list somewhere down the line).
tension maintenance - settling loss is higher with multis generally than with synguts. other than that it is quite difficult for me to comment because synguts in crosses usually last me around 8 hours (about the same as poly mains) and until then i have so far not experienced any "dramatic" drop. multis keep going for about 4 hours and the situation has been similar. due to the somewhat higher settling loss of multis i do usually string them 1-2lbs higher than synguts. the tension loss after each session is rather small and does not affect playability of the stringbed usually - it's the poly mains that eventually mess up the stringbed.
