I would wait.....
Dynojet --- the makers of items like the Power Commander, is coming out with a version of their Powervision CX for the Spyder. This is plug-n-play and allows YOU to flash your own ECM, back up the original, run various setups, clear codes, etc. The unit is about the same price as an ECM flash from one of these vendors, and unlike all of these other flash vendors, Dynojet is going to be posting actual dyno runs showing the improvements. None of the vendors doing flash upgrades are showing dyno results... it's all 'seat of the pants' testing.
The units should be out in a few weeks and will run around $385. Once you plug it in you can backup your original settings, download various other versions, etc... then you unplug the unit and put it away-- does not have to remain plugged in. Once you run the unit on your Spyder it is linked to it and will not work on any other Spyder.
I'll be getting one as soon as available....