It COULD be very good if...
... the conditions are right. Right wind range, right wind angle, course leg length is long enough to make it worthwhile launching, etc. An asymetrical is just one more tool in that tool box to get that little bit extra drive.Generally speaking, flying sails give more than they take away in PHRF penalty so if the conditions are there then you're ahead. Not knowing anything about the kind of races you plan to be in (say, the same old local races where the courses are pretty well established or going to all the regattas with numerous courses), how often the boat will be seriously shorthanded (if you're just starting and don't have a top race record this will probably be more often the case), it's hard to make recommendations.The first thing, though is to have a CLEAN and SMOOTH bottom.Next, for the money, the first piece of equipment I'd recommend puting on is a low-drag prop, like a Max-Prop for example. This you can use ALL the time, on EVERY course, will give more speed and velocity made good, and will help the boat track with less leeway.As for the subject asymetrical recommendation it would depend on (1) how it fits into the sail inventory (yet to be established I guess), (2) how good the quality is (not blown out, proper cut and draft for the intended purpose), and (3) how good the price is (if really good and criteria (1) and (2) have been met). Otherwise, if not, I'd put it lower down on the priority list.I'd be curious about the other opinions you get.