I use "Instead", which I buy at the local Walgreens, and Dillons also carries them. I first saw them about 10 years ago, before I had heard there were any other brands. It was a totally new concept for me and I had to try them. They come in a box of about a dozen for $6-7. The recommendation on these is to use them for 12 hours and dispose of them, much like a tampon. However over the years I discovered that I could reuse them over and over again, just like the more expensive brands. I started by using one for the whole period and then disposing of it, so a box would last me about a year. Then DH suggested "why not just reuse it the next month?" so I did. It has been several years since I last bought a box, as now I reuse one cup for several months.
As for spillage...I just remove and empty over the toilet bowl, so any spillage goes where I want it to. Then I rinse it out and reinsert. Before I discovered cloth pads, I used a disposable pantiliner just in case. Once I switched to cloth, I continued to use the pantiliner, (or pad for heavy nights) so for me the cloth pad is more of a back up for when the cup gets full.