I happen to own both a 2007 HHR 2lt loaded up....& my 2005 PT GT vert with 2000 miles on it.......
As far as interior PT win hands down....
as far as ride.....electronics...Onstar...sound system....fuel economy....mech. break down....HHR is on top.
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2005 Plum Vert GT Turbo HO
Nav, Chrome 17" Wheels 5 Speed
K&N Typhoon Air Intake, AOOgah Horn, Freedom Design Strut Tower Brace
Some chrome here & there....