I bought several of medium, large and jumbo sizes. The slightest breeze sends all the covers flying. I bought some relatively cheap .5" neodymium magnets to replace the worthless things that are stitched into the covers. I bought some hem tape from a craft store to repair the removal slits. I do not sew.

I have been purchasing and using faithfully, the HTC covers for a few years now and swear by them. I have listed a few things to think about. Be careful before you order these covers. Make sure the size (dimensions) is correct for your needs. You may think that a "medium" cover may work for you when if fact a large or jumbo would have fit better. You will want to have the cover drape over the object being protected, not just covering the tops.
My woodshop is located in the garage. If the heat is off or down low, the average temperature is 40 degrees. The shop is well insulated and will hold that temperature even as the outside air is much warmer. That's where the problem starts. If I open the overhead door on a nice warm, MOIST day, the cold machine tops act like water magnets. In a day or two a slight film of rust will form. It's like taking a shower and having the cold bathroom mirror steam up, only on metal surfaces the moisture is absorbed into the pores where the oxidation or rust starts its nasty process. The HTC covers really do prevent this all from happening
I use these covers for all my woodshop equipment for three reasons. #1 reason, to keep the cast iron tables from rusting. #2 reason, to keep dust, which collects and holds moisture (like mulch in your garden) off my idle equipment. And the #3 reason, to keep the peering eyes of pedestrians and vehicular traffic (my garage is near the street and sidewalk) from seeing all the expensive toys when the overhead door is open.
The first two reasons are worth the cost of the 8 covers I own. The third reason is just for my peace of mind!

This is a great product to protect costly equipment from the detritus created in the shop. I particularly like the weight of the cover, which prevents slippage.

I have a couple of these HTC machine covers. The material seems of very high quality and I'd expect it to perform well overtime. After a couple of weeks in my garage shop, in the South Carolin summer, my covered tools seem to be doing just fine - no collected moisture and no rust. The construction is solid. This size cover works fair on my Jet bandsaw, the length is ok but the width results in open sides. I'd just as soon have grommet holes for bungee cords than the magnets. They aren't particularly effective at holding the cover neatly in place. Overall, though I'm satisfied with my purchase.

I used to use tarps in my old workshop, but they would hold moisture in, so I had to resort to keeping a layer of talcum powder on the surfaces of the tools to absorb some of the moisture away.

As I live in the South Jersey Pinelands, where it has been getting very humid lately, the moisture doesn't get trapped under the cover, but "breathes" right through, just like a top quality car cover, with the difference that it actually gets used regularly.

Oh, by the way, I still do the talcum powder thing, as it is an excellent non-staining lubricant for woodworking tools... better than light machine oil or waxes, both of which can stain the wood being machined.