SkyguardTWX Reviews?

We were planning on installing a Navworx ADS-B in our RV7, but have had second thoughts due to there current FAA issues.

The SkyguardTWX looks like it may be a good alternative, but I can't find much discussion on the internet.

Any feedback, information or reviews would be appreciated.

http://http://adsb.skyguardtwx.com/uatessquawk-transceiver-model/

After looking at the external antenna requirements for the Skyguard TWX unit. I'm not sure my RV9 has enough real-estate on the bottom to be able to mount all and meet the min separation! No other negatives on the unit that are apparent except it "looks"like a portable unit and not sure how that might go over.
I am just wondering if the Navworx AD might be an effort on FAA part to rethink the " meets performance standards" and if we will have to "meet performance standards" by having a TSOd unit. ?

Keep in mind, in planning your budget, the SkyGuard does not qualify for the $500 rebate.