Last weekend we went to our local farm's annual tomato tasting (yum, 52 varieties!) and at one table I spotted a volunteer slicing her batch with this crazy implement. Made by All-Clad, it has the typical serrated blade, but it sports an enlarged, rounded tip that is for serving (perfect for a tasting, but my guests usually aren't so hungry that I need to serve slices right off the knife!).
The most bizarre feature is it's handle which is just like a piece of All-Clad cookware: long, heavy, indented, with a hole for hanging. A little research turned up All-Clad's line of Tools, all featuring this "distinctive handle design."
A tomato knife is one of those things I just skip: I use my bread knife. I could see this being a silly gift for a tomato aficionado, but I can hardly imaging buying it for myself. I'd rather save my $20 to put toward a fancy Texas Tomato Cage to hold up my bounty.
• Buy the All-Clad Tomato Slicer (ChefsCatalog.com, $19.99)
Straw Mat from The ...

wait, $20 and it's All Clad? that's got to be their cheapest item ever! and it's silly...very silly!
This is just what I was babbling about in this post:
http://www.thekitchn.com/thekitchn/tips-techniques/quick-tip-use-a-bread-knife-to-slice-tomatoes-061216#comments
I'd rather find a vintage one, but it's certainly not the most frivolous tool I've even seen.
This doesn't solve the problem of getting even slices from the whole tomato. I'll keep my cheap Target brand slicer, thanks.
it looks unwieldy and cumbersome; a simple serrated knife, from target as well, great for Italian bread does the trick (it also equals my "less stuff" philosophy; I only have two kitchen Knives).
ooh, sorry about the poor grammar; I thought that I fixed it when I changed the sentence!