Thats seriously cheap, works out at just over £10.00 delivered!! Just how cheap can these things get ?
And there's not too much wrong with these carts either as long as you get a quality mem card... hint Kingston(japan) or Adata, forget sandisk tho.
I use the DSTT and Yasu menu on my SCDS1 as part of a tripple OS system, I prefer the Yasu one myself, which you can also use on a real DSTT cart, they both play all the roms no problem, and support the 'big cheat' xml file you can get from gbatemp.