Laryngeals revisited

Form what I can tell, the 3 laryngeals are vowel-changing sounds. I've
seen several views on their indentities: aspirated (like the Russian X
or German "ch" in "Bach"), as variants on the schwa, and as sounds
like the Arabic or old Hebrew ayin (glottal plosive), aleph (glottal
stop), and heh (an "h"). Which is most widely accepted? And would
there be a "w" sound in things like *kwon, or would it be like a
close-mouthed "kon"? If there IS a "w" sounds, wouldn't Pxwter sound a
bit too consonant-based? Unless of course, PIE was like Georgian and
generally dropped vowels.

Amd is it now more generally accepted that Hittite is the first branch
of PIE?