I just had the i2500 installed in my 2100 sq ft 2 story house this March, and I used it today for the first time (besides break-in fires). I chose this stove bc the price wasn't much more than the i2450 (the non-cat version of the i2500) but included the tax rebate, so the cat stove will end up being cheaper. Like others have said, due to the cat placement, it may not provide much additional heat (if any lol) , but it is still worth it to me because of the price. So even if u never engage the cat, or it doesn't provide extra heat, you can still run the stove and get identical performance as the i2450 but for less money in the end, and if you do get longer burns/ more heat then it's just icing on the cake, plus the i2500 has a digital thermometer for the nerd in us all lol. As far as Lopis go, I've never heard a bad thing about Lopi, so if you go that route I'm sure you'll be happy also. I have to say so far I am loving heating my house with wood, it's a wonderful sense of satisfaction. This is my 1st wood burning insert/stove so I have nothing to compare it to, but I am happy with my choice so far.