I've had a Javelin for a while now, and I thought it was about time to upgrade. The Javelin PRO is much larger than the Javelin, which is one of the main reasons for the upgrade, with the probe measuring almost 4.5". In terms of performance, it's noticeably faster than the standard issue Javelin. It's just as fast as my Thermopen, if not a little faster, I would say just a fraction of a second less. Accuracy is dead on, just like my Javelin.
The version I got was their limited edition. It comes in olive drab with a black titanium probe. It looks very special forces, I like it a lot.