The capper shown is made of plastic with a metal cap crowner and a rubber plunger in the center of the crowner. The process is to place a cap on a filled bottle, center the capper on top of the beer cap, then pull down on both levers.  There are semi-circle grabbers that help keep the capper on the bottle as you cap it. The levers force the cup shaped metal capper over the bottle cap, crimping the cap onto the bottle.  As you lift up on the levers, the plunger in the center of the capper comes down and ejects the bottle from the capper. 

It does the job,  I will give it that much, but it can be a frustrating experience.  I brew with my friend, and when it come time to bottle, one of us fills, and the other caps the bottles.  I like this to go as quick and smooth as possible.  The capper tends to be slow.

The first problem is that it can be a challenge to get the capper centered over the beer cap without knocking the cap off the bottle.  Not a major problem, but is rather annoying, and it happes too often, even though I have been using my capper for a few years now.  Sometimes the cap will shift just a little, get bent and not cap.  Toss the cap out and try again.

The second problem is that it seems to take three hands to work with it.  One for the bottle, and two for the levers.  I only have two hands, so something has to be compromised. SInce it takes two hands to work the levers, the bottle must be left to stand on its own.  That is ok, unless you don't apply the force to the levers equally.  Then the bottle wants to tilt and fall over.  I have bottled many hundreds of bottles with this capper, and fortunately never lost one. It must just be quick reflexes or luck, because their have been times when they began to fall over. 

The capper just feels flimsy, too. It is made of plastic, everything just flexes, and it does not feel very rugged.  That is probably the least offensive of its qualitys.  Perhaps it just my perspective, since the antique that I used to use was made of steel, and was very sturdy.  I could live with the plastic bendy, creeky feel of this capper, though. 

The biggest fault I find with this capper is the part that actually caps and crimps the caps.  It is basically an upside -down metal bell shaped cup.  On mine, the metal has rusted.  This creats a lot of friction between the capper and the cap.  I try to keep it clean and dry when I an not using it, but I store it in my basement and the humidity just puts a fresh layer of rust on it between batches.  When I do go to cap the bottles, I clean the rust off the inside of the "bell".  Still,though, bottles will stick in the capper and require me to twist and pry the capper off the bottle.  The plunger (which should eject the capper fron the bottle) sometimes works, sometimes not.  Often it will leave a plunger mark ( a small indentation)  in the center of the cap.  I live with it, but it is still a very annoying problem.  Additionlly, all this twisting and prying has caused the metal bell to get out of round slightly.  It still caps effectively.

If this is all your budget will allow, then rest assured that it does work and will probably last a very long time. I have used this capper for years, and will probably continue to use it until it breaks, stops capping properly,  or causes me to spill some bottles.  Given what I know now, I would find a better capper.  My suggestion is to look for a free standing unit, one that only takes one hand to operate.  Check the quality of the materials, especially the capping bell. The more solid, the better.  Consider it an investment in your hobby.  Spend the extra money and get a quality capper that will last.  Or find a nice antique capper.