It's more or less the same although I think the detection algorithm in SPlat is maybe a touch worse than X3.
That all said, I've done literally hundreds of tracks of metal drums in SPlat by now, and if you know how to work around the detection weirdness in AudioSnap (search back through my replies, we had a good discussion about how to overcome that in the Techniques forum, I believe?), the rest of the program more than makes up for it and is rock solid stable.
Just importing templates in to record new drum takes is stupid fast. I can load up 24 mics, all input assigned and armed in a couple of seconds. I can run drum subgroups and effects right in the track view using Aux tracks now. It's seriously a massive timesaver and great workflow enhancement. Upgrading is a no-brainer.