I have a problem with trying different sights and have spent more than a fair share on swapping them in and out that I would have easily paid for a sight pusher. That said, I have a couple that I want to swap into my G20 and also my M&P so I was thinking about getting one of the cheaper ($75 or so) pushers. I was wondering if anyone has any experience with pushers in general and better yet if they can recommend a decent one. Thanks!
A good "universal" sight adjuster/installer will cost $500-1000+. The cheap "universal" installers will work with many different slides, but they don't do any of them well. Been there. Done that. A good one for each pistol brand is the best option, as they work better than any universal or cheap installer. They'll cost $100-200, each. I like MGW, especially for Glocks. The "All Glock" tool costed about $150, but it's worth it. No hassle, works every time, easily, and NO damage or binding. It locks the slide by the rail grooves, accommodates all Glock slide sizes, and about 1/2 dozen sight brands I've tried. The performance is similar for other pistol brands. If you are installing or adjusting night sights, or any other sight that's not just solid steel/plastic, they are a must to prevent damage. If you go cheap, you'll get what you pay for. Find the installer you want, and shop around. Brownells has many/most of them, but their price+s/h isn't always the best. START HERE (http://www.brownells.com/gunsmith-tools-supplies/sight-scope-installation-tools/sight-adjusting-tools/1911-auto-sight-mover-sku584045001-8846-21911.aspx?mc_id=14000&ch=csh&gdftrk=gdfV21820_a_7c187_a_7c644_a_7c584045001_d_584045092_d_11401), and work your way around.
I go old school and use a padded vise and a punch that is softer than the sight, along with a brass hammer. So far, so good. But sometimes it is a little nerve racking.