I can't believe I've waited this long to get a product like this. In the past I've tried those cheap little vacuum kits from the car store, and of course I've tried enlisting the help of unwilling teenagers or spouses, and used jars, a variety of tubing around the house, and even no tubing and just a glass jar.Bleeding brakes is a piece of cake. Flushing fluid is just as easy, you just do it slightly longer. So you'd think there would be little room for improvement in something that's already so simple. Wrong. This thing is fantastic.The tube itself is silicon, which means it pops right on, pops right off and is perfectly sized for bleeders. In the past I've used more readily available PVC tubing and trust me, silicon is much better handling. Unfortunately silicon is rather opaque, but I was able to clearly see air bubbles in the tubing. I couldn't really easily tell when I had flushed out all the old fluid though, because the way my resevoir is designed I couldn't remove all the old stuff from it first, I had to just keep adding new to it and so there wasn't a really obviously "dirty, new" change: it was more dark brown fading out to yellow then eventually clear. That meant that it was a bit more difficult to see in the tube. Next time I'd like to see if there's colored fluid I can use. That way as long as I keep changing colors it will be really obvious when the new fluid has chased out. The jar can hold an entire flush, although I emptied it between wheels so I could inspect what was coming out of each one. It's translucent, and you can generally see the color of the fluid. In the photo's you can see how easy it is to tell that the old fluid coming out is dark brown (I'm a bad car owner, and I should feel bad). You can also tell that it's clearing up, although you can't quite tell if it's yellow or white. As the new fluid mixes in it can be hard to tell, particularly since the silicone tube is a bit more opaque. However, if you unscrew the lid and peek in, the tube that's inside is PVC and quite transparent so I just kept going until it seemed like I had flushed, could see some "layering" of fluids in the jar, then I'd just unscrew the lid and peek in to confirm. I suppose that is one advantage to PVC hosing - it's perfectly clear so you can see exactly what's in it, but I much, much prefer the handling of silicon tubing.The built in check valve works pretty darn well, and definitely makes it safe for 1-person bleeding or flushing. I like that the vale is on the INPUT side (the red nipple) so you can unscrew the lid while it's attached without letting air in.There's even a black nipple that you can use to attach a vacuum hose if you want. I found that to be extremely helpful, and check this out -when you're done using it, you just pop the end of the hose on the black nipples and no spills - you've closed the system !The magnet seems just strong enough. I let it get about 2/3 full at one point, and the magnet held strong. As others have said it is riveted in, so take care not to rip the plastic bottle.Every other time I've tried to bleed or flush my brakes it's been a total pain in the ass of trying to track down one of my lazy teenagers ,and then when they do finally get off their butt and come help, it's the old "ok, press down a few times, hold down, ok up". This device made flushing so easy I actually *enjoyed it*. Yes. I actually enjoyed flushing my brake fluid using this.If you do your own brake work, and you're getting along just fine without something like this - buy it anyhow because seriously you don't realize how nice and easy it can get. You wont regret it. Using this product is the first time I've actually enjoyed flushing/bleeding my brakes.