What is it about LML and flame mail?  The latest is the OP vs. Chelton/ certified vs. uncertified string.  And not a word from Rick Shrameck anywhere in the debate!  FWIW:

I have flown my Legacy for about 3.5 years and 500 hrs.  It has both certified and non-certified parts.  In my personal experience (which may vary from the experience of others)the certified parts (fuel pump, vacuum pump, HSI, LASAR electronic system and both mags) are more prone to failure and less well supported by their manufacturers than are the non-certified parts (autopilot, backup EFIS, airplane, engine (IO-540EXP)).  I therefore cannot conclude from my personal experience that certified parts are better, more reliable, better serviced or more satisfactory in any other way than are non-certified parts.  Because I cannot personally confirm that the process of government intervention makes a product better or safer, I prefer to think of equipment as either good or bad.  My (up to this weekend) panel had good certified equipment (Garmin 530 and 430 and the rest of the stack), good uncertified equipment (TruTrak).  It also had bad certified equipment (HSI, vaccuum system) and bad uncertified equipment (WSI).  Win some, lose some.

When I began thinking about upgrading my panel, I considered both the DirectTo and OP products.  I liked both of them and still do.  Both of them offer truly awesome advances in navigation technology.  Anyone who thinks either system is not reliable enough either has not been flying very long or doesn't remember the old systems very well.  (Anyone else remember 60 degree lock-offs, chasing the ADF needle on final approach as it swung wildly 10 degrees either side of the actual bearing, dialing in the wrong VOR or TACAN frequency, forgetting to check the to/from indicator?) Both the Chelton and the OP systems have been designed and engineered by competent professionals who design for the most demanding customers.  As an early implementer, Chelton is a bit ahead on the development curve.  As second in, OP has had an opportunity to go to school on the Chelton product and make what, to me at least, are a few design improvements.  Both systems have experienced shakeout issues which both seem largely to have resolved.  I understand there is an issue with the Crossbow product in the DirectTo system which may extend to the comparable OP AHRS but I have been getting a steady stream of AD's from Lycoming on their solidly certified, 1940s technology engine, to say nothing of the letters from the vaccuum system people suggesting that it is criminally insane for anyone to ever use their product, none of which leads me to condemn all certified products or suggest that only a fool would ever install one.  Both Chelton and OP offer TSO quality GPSs and GPSs that, whatever their quality, cannot meet TSO standards.  For Hamid's benefit, I used the term "TSO-able" in an earlier post only because I understand that the TSO standard involves not only product quality and reliability but also the manner in which it is installed and tested.

I think I have told this story before on the list but I had an instructor in the Navy that would bet any student he could beat them on the bomb range.  The student got to use the state-of-the-art gunsight.  The instructor made an x on the windshield with a grease pencil.  He never lost.

It's all good.  Buy what sings to you, have fun and be careful.