To supply some real world data:
At density altitudes from around 3500 ft to 7000 ft I got
between 250 and 300 fpm with 170 lbs pilot weight
and 180 - 230 fpm with (2 persons) 380 lbs (no additional water).
(VSI-Output, no precise measurement, but in correlation with altimeter
data).
Theese values were very similar in two different airplanes.
I think this climb rate is really acceptable for a sustainer only engine,
but please do never expect to escape from a downwash with a sustainer
engine.
A glide ratio of 16 seems realistic for me with the engine extended but not
running.
So before extending the engine look out for an emergency field near by.
I hope this helps
Walter Kronester

PS: I love this bird!