I was a PL30 user but due to broken therefore now using Hippo Shroom EB. Saw the latest E30 seems like not bad. Anyone using it? Any reviews for it?

Just want to know how is the sound quality in term of clarity and bass.

From what I heard from the seller last time he said pl50 is more to balance clarity and better soundstage.. I tried once before purchased my pl11.. Quite good.. Xba1 never tried before sorry.. Both headphone in d same class?

Yeah, PL50 and XBA-1 are in the same class. Both are priced the same, and both are single BA.
PL50 is quite possibly the most comfortable IEM I've ever owned. Both ergonomics wise and sound wise. Clarity, speed, detail and warmth all in one package. Not as good looking as the XBA-1 though.

Hmmmm....I am rather interested in the XBA-1. Thinking of getting a HisoundAudio Golden Crystal and an XBA-1 for when I'm in the mood for some signature change....

I must say though, that the PL50 will not be a wrong buy. Bass is adequate for a BA and it's presentation of the mids is very good, great for vocals, especially male vocals. If my local Sony dealer has an XBA-1 I could take a sneak peek into its sound...although almost all of the time they'd only let you try their IEM/headphone if you are actually buying them. I tricked them once into letting me audition the XBA-300 headphone.