I had a cheap $100 Amazon one for my house (Work has a pneumatic) I had to put so much elbow grease into grommeting anything...all my weight. I hated using it, but for the odd banner I do at home I needed one. One day when I was doing a banner It snapped in half... so I bought one from Grimco.
Captain Series Hand Grommet Press $191 CAD
The first time I used it... I was putting so much pressure on it and it wouldnt budge... I thought I got a piece of crap worst than the $100 amazon one. but it turns out the grommet was pressed in all the way... So I tried a new one with very little pressure...sure enough a perfect grommet. grabbed some coro... tried it and with 1 finger I could do a perfect grommet... It was amazing the difference. I thought all handhelds were crap... turns out just the cheap $100 amazon / ebay ones are crap.
I cant imagine it being easier than this cheap grimco one... but I wouldnt hesitate to buy a simpson or hiker for $3-500 now that I know theyre not all garbage.
Whatever you do, stay away from ebay/Amazon ones...