It's true, dry is dry and wet is wet. (How profound!!) With that being said, a dive buddy of mine got one of the Pinnacle suits this fall. I'm not sure which flavor it is tho...
Sizing- as these suits really need to be a close fit to function as a semidry the fit is very important. His shop measured him, went by the Pinnacle charts and then Special Ordered his suit. When it came in the fit wasn't even close and he had to repeat the process for a larger size.
We dove the local quarry together in November. Biggest takeaways from those dives: it took him longer to get in the Pinnacle than it did for me to get into my drysuit. More struggling due to the horizontal zipper, the inner barrier and the attached hood. When we got him all kitted up and dove some comments from him- not quite as warm as he had thought it would be (compared to a 7mm farmer john combo, but warmer that a 7mm full suit). Less weight needed comapred to the f. john. Less water flow (most of his core was dry after the dives) allowed him more bottom time before he started to get cold. One surprise- back on dry land he was not as cold in the air as he had been with a regular wetsuit. He attributed that fact to being dry under the suit.
My buddy does not have the interest in a drysuit at this time. He understands the advantages of being dry, but he only dives cold water on a fairly limited basis and does not want to commit to the expense of a drysuit right now.
Hope this all helps.
Hank