Got it. The IS is slightly bigger than my medium sized princess at 3.2 CF though Woodstock has been overly optimistic in the past with their firebox measurements so you're getting a pretty large medium stove with the IS. The biggest that woodstock makes. The IS is the stove I would choose from woodstock if I had to replace my princess cat stove since it is welded steel, very efficient, a straight in front loader, easy cat access, and user reports show a wide range of available outputs. It can burn at really low settings for a long burntime or high settings for a shorter burn time. The PH for comparison, though smaller, can not be turned down as low so burn times are much shorter.
The Woodstock stoves don't look normal. Neither does my BK. Must be something about these high performance stoves that they have to be weird looking! So be sure that the "look" will fit in with your house.