I didn't want to make a level editor, I thought it would be a waste of time and something I would yet again over engineered, spend countless hours reinventing the wheel, and only wanted to make because it sounded fun.
Initially I was using Photoshop as my level editor and png files as the save format, worked great, did the job, but was very fiddly and hard to use. So I though "I will throw one day at an editor and see where it gets me"... I would say it was well worth the risk, and if it all went tits up, I would have only lost a day.
As @rickard wisely noted, this editor is for this specific game only, it is not intended to be a generic editor. Given how quickly it all came together, in future I will not be afraid of adding a quick custom level editor to a project .
NB. This is applicable to me since I have a bit of jME experience and it was relatively quick to build for me, speaking from experience: for a lot of the newer monkeys out there, DON"T WASTE TOO MUCH TIME BUILDING TOOLS FOR YOUR GAME! otherwise before you realise it, you have a suite of tools wrapped around a broken unfinshed 'game'. A working game with one level is infinately better than having a broken game with 100 levels