I have both of these models and they are huge fun (though not really jets, this thread really belongs in the foamie/electric section).

I would have to advise on the Twinjet, as with the Microjet weight is everything and decent batteries in something that small are a problem. Suitable batteries for the Twinjet, either 8 x sub-c cell or 10 x sub-c cell are in good supply and relatively cheap. On 8 cells the Twinjet flies well, on 10 cells it's good, even on the stock permax 480 motors.

If you want to have REAL fun then get yourself a couple of 400 size brushless motors and a good 40+ amp rated speed controller. I recommend a pair of Kontronik "Fun 400-23" motors with a Kontronik "Smile 40-6-16". Get some prop adapters and use either 5.5"x5.5" or 6"x4" props. On 8 cells that setup will go vertical from launch and on 10 cells is a veritable electric missle. This setup isn't cheap considering it's only an electric foamie, but you'll surprise everyone at your flying field when this little electric foam jet blows their IC trainers into the weeds and gives a good 12 minutes flight time on a 3300mah pack (8 minutes on continuous full throttle). Trust me, you will fall in love with your Twinjet as have many people. They have a really long glide and fly really, really, well. There are many mods you can do to them and some have been clocked at approaching 100mph. Apparently, the ultimate setup for the Twinjet involves modifying it to take a single 500 size brushless motor mounted centrally and a 10" folding prop.

With a few battery packs, a leisure battery and a decent quick charger you can have a whole days worth of fun at the patch and not have to worry about fuel and mess. If anything happens to your Twinjet then it will be a little more forgiving than a Microjet. It's a little stronger and a little less flimsy. Though with either model they can be repaired at the field with generous amounts of CA in mere minutes.

I've spent some serious money on a whole number of different models (gas turbines included), but I love my Twinjet. I can just turn up with my TJ, a bunch of battery packs and my TX and just go and fly - no hassle!

TWINJETS ROCK !!!

Phil