The clarity of the X24's Tweeter? Especially If you've got a high-quality, high-bitrate-encoded recording made with modern recording equipment? Is uncanny how real and true to life it is!
The responsiveness of the Remotes cmds.
The nice crisp clarity of the Remotes screen.
It's effective range, (though I seldom setup very far away personally)
Big ol honkin' Lithium battery that lasts forever.
Stupid little things like the fact that it just automatically starts a timer for you once you begin playing your set. Quickly you find yourself really making use of that.
Quickly found myself LOVING this thing and appreciated how much easier everything was to do! Vs the beginner eCallers of other brands I'd tried. ICOTec GC300 and Johnny Stewart GrimSpeaker2.
That GS2? It has some potential, if they could just get their remote to be something you'd call "responsive". That company could... really clean up with that product, saying that because of what it'd be capable of doing, if they got the remote straightened out. And used better Tx/Rx components I'd imagine. But I'm sure that'd jack back up the units cost I'd imagine. Theirs was more sensitive to playback of encodings of files of less-common bitrates and such. Sometimes if it didn't like the encoding, there might be some weird "artifacts" in the playback output. But usually that was with older WAV recordings I'd then converted up to *.mp3's, but not of very high bitrate, since the original source recording were some Johnny Stewart Ol Skool vinyl 45's I'd got handed-down.
But yeah man... eCallers? It works a lot like with buying binos. Suck it up, and go ahead and cough up that more loot that you're uncomfortable with parting with. They Joy you'll experience at how much easier/simpler/better/more-reliable it is to use, will quickly get you over the sting of the initial purchase price. Then you'll wonder why you waited soo long.