I ve been flying our Raven 1 for the last 3 years from sea level operations to confined pads at 5000', never had any problem, always kept the carb temp around 10 degrees or so. The injected model cost quite a bit more initially than a good Raven 1 and if you're starting up a tourist ops, every penny counts.
I might even consider selling my Raven 1 as we now have an EC120 as well. PM me if you're interested.
WLM