skyguard adsb

[WaiexN143NM]

hi all,
on the zenith site, classifieds for sale, http://www.zenith.aero, a post was made about an ad on barnstormers for skyguard twx adsb units, in/out 2020 compliant experiemental use only.
someone had bought them for a flight school in south dakota C-150’s, but when they couldnt be used for certified
aircraft they are selling
$$250 with antenna and cables. value new about $1500 with antennas.
i looked thru the posts on this forum , a few, john gillis didnt really have good reviews,so at your own risk.
supposedly 15 units, i dont know how many left, ph number barnstormers ad for wilber, not a cell number, must be a landline.Please read all comments on the zenith site under the post.
FYI
anyone on here using a skyguard? comments?

michael