I tried it out today, and I have to say I like it.
Does it drunk much juice while online? Whatsapp is pretty light, as it rarely even shows up in the battery use menu.
ps: I found the texting to be somewhat messy. I typed the sentence and pressed "send"... then I kept writing and it sent the sentence I wanted plus part of what I was writing.
When you're done with the text, that Send button should clear the text field so you can type the next text.
Just my thoughts.