Diffuser?

[NicholsonPhotography]

I need a diffuser for my 580ex...I have no idea what to look for. I've read through some threads on here, but I'm still lost. I don't want to spend a lot of money...As long as I can get something to help with the harsh shadows.

I've read lots of posters with strong opinions against cheap things like this:
http://cgi.ebay.com/Bounce-Flash-Diffuser-for-Canon-Speedlight-580EX-580-EX_W0QQitemZ250346562645QQihZ015QQcategoryZ64354QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem

What's wrong with something like this? Could it make anything worse than what I'm doing now (no diffuser at all)?

[Titus213]

Check out the Demb FlipIt. (http://www.dembflashproducts.com/flipit/)

[NicholsonPhotography]

Thanks.

[w7cma]

Check this out, specially video #8 I made a couple and work great. Cost about $3

[w7cma]

For some reason I can't edit my post, here is the link to above post http://abetterbouncecard.com/