If you haven't joined her Yahoo group you really should! It is a 'no chatter list' that she uses to let you know when the new images are up, posts samples with her images and she also runs some great specials!
http://groups.yahoo.com/group/missybdesigns is the address or she has a link to it on her website.
She puts out new images every other week (literally - every 2 weeks) and is AWESOME about taking your 'wants' and making them into stamps! She posts to the group on occasion asking for ideas from the group members so SHE is making what YOU want! Several of the sets that are out on the site are from stamp requests and she really does listen to everyone's ideas! I can't say enough about Melissa's focus on giving the stamper what they want!
And as Lauren said - the service is great! She is doing everything she can to make the turn around time as short as possible! She is a one woman operation - the rubber is pressed off site but she is a full time mom of 2 little ones that does all the rest!
Okay...sorry - enough babbling now.