I've done more than my share of research on these things, and almost pulled the trigger a couple of times.
One thing I know for certain is that when it comes to these, there is kind of a "catch 22". It's good advice to see whether you like the game before dropping a ton of cash, but the quality of the pad directly affects the experience you will be using to judge whether you "like the game". Playing these games on a POS soft pad is brutal, and you'll quickly become frustrated and stop wanting to play.
So chances are, if you are considering this type of outlay for a good one, you already know that you are "into it".
I wish I had some experience with a good one to give you a recommendation, but I don't. What I can say, though, is that the method used to sense the arrows is the biggest consideration. Any half-capable carpenter can design a sturdy platform, so that's not usually the flaw (unless you try to go very cheap). The real platforms use 4 of these so-called "tape" sensors per arrow, so it's no accident that they are so responsive. The hitch is that even the best wholesale price I have seen on these sensors is about $16 a pop. That's $192 per platform in just sensors! The one linked to above uses these, but only 2 per arrow. Probably enough, but still not the same as the arcade version.
In any case, you tend to get what you pay for with these, even if you do your research. An arcade quality platform is going to cost nearly arcade prices. No way around it, unfortunately, which is why I'll probably build my own when the time comes.
RandyT