sidepress

Hello guys, I want to start practicing the side press, and want to make it my primary pressing exercise for about 3 months. With this time frame and using a strict press 5rm bell, what will I notice to improve or develop in my strength. Comparing it with the strict press, how will it develop...

Although I have read basically all the other books, I just bought PTTP in kindle. It was not available before. Do people actually do the sidepress with the barbell as in the PTTP original book or is it considered dated and something better for intermediate lifters? I rarely see it mentioned...