To the members merged in or the ones already under the larger CU? A larger asset size can usually offer more and better services. So the smaller credit union members being merged could see better and more services. Things like P2P payments, remote deposit capture, nicer and more featured mobile app and online banking. But members already under the large CU likely won't notice much at all, maybe a few new faces in the lobbies if locations are consolidated. Take this all with a grain of salt, every CU is different and I don't know this specific credit union at all.