Nice, that's one of the better deals I've seen. Although, I will boast that I managed to pick a 3 and a 4 for $70 and $90 :P
TF10 is more V-shaped than the relatively balanced XBA-3. TF10 has a MUCH more aggressive treble which is sensitive to harshness and sibilance, but it extends better than the safer XBA-3. Low end is also much better on the TF10; Sub-bass has lower extension. Mids on TF10 are more recessed than the XBA-3, which has a fuller and more embodied midrange. I prefer the T10 here.
No, the XBA3's treble extends further, the TF10 caps at 17khz, XBA3 goes up to 20khz. XBA3 has way more subbass extension than TF10, it rumbles more, the TF10 has more midbass not subbass. It's shown in their CSD, the TF10 doesn't reach nearly as low. TF10 does have more recessed mids and a harsher treble.
So I decided to listen to the 1's for the first time since I got the 3;s....wow is all.
They sound muddy and very little bass, things get hectic when there is a lot going on too, the 1's are very good but these are just SO much better.
Man now I wonder about the 4's....
I bought the Best Buy refurb of the XBA-3iP, and owning both it and the XBA-1, I have to say it feels like a more refined version of the XBA-1, like it's fully achieving the sound the XBA-1 is going for. I'm not sure I would have been thrilled with it at $300, but at $75 it's an absolute steal, easily the best IEM deal since the $90 TF10.