depends on what type of gun you plan on using it on. Glocks are easy, XD's 1911's not so much. I have tried a few different brands and this is the best I have used so far.
They have 2 models and the cheaper one won't do full size 1911's...ask me how I know.
It is not universal and you have to buy a slide shoe for each model but they don't cost much
Main Sight Tool - Now comes with the 30 degree pusher block for Glock®and HK sights. A must have for Gunsmiths and Armorers. The Sight Pro uses a unique clamping shoe design, plus 4 slide support pads and a white nylon spacer block to lock the sli...
I have the wheeler you pictured.
Bought it as my first pusher tool to do our m&p shields. Still needed a punch and hammer to get the factory boogers out but putting the new ones in was a breeze.
If you have the $ and plan to replace sight on other pistols of yours, then go for the Wheelers one you posted. I have had it for years and it works great.