I have no problems using Tampax or OB. I do like to use something resembling the Instead softcups. It's called a moon cup and I like it SOOO much better than anything else I've used. It doesn't leak and there isn't a string. It's way nicer than worrying about a tampon.
http://www.divacup.com/
http://www.mooncup.co.uk/
http://pacificcoast.net/%7Emanymoons/keeper.html
