I think the only reason the LT-40 is preferred over the LT-25 is that there are more second plane choices in the 40 range. As for flying abilities there is no doubt that it flys just as well as its bigger brother.

My buddy just did an electric conversion on an LT-25 and it is perfect for this. He even flew it in our fun-fly contest.

My first plane was a 3 channel Kadet JR. so I can attest to The fact that Sig makes excellent kits that fly right.
Glad you are satisfied with yours.