If you are considering purchasing anything from Airspy.us you might want to check out this thread.
I ordered & paid thru Paypal from them on January 14, order shows as "processing" and emails requesting an update go unanswered. Very unusual, as I have ordered from them previously & always got fast shipping. Their website does not have any contact info other than a web contact page, which I...
forums.radioreference.com
I returned an Airspy R2 that failed under warranty in June, that was over 5 months ago, they still have the unit,
every time I ask for an update they give me another excuse, unlike when I had a problem with an SDRPlay earlier
this year, the SDRPlay was repaired and returned in less than 2 weeks.
I know certain software can only be used with the Airspy so you may not have a choice.
If you never have to return anything for service then don't worry about it, but if you do be prepared for non-existent
customer service.
Almost forget to add, I had to pay an additional $60.00 before they would issue me an RMA, I am betting if they ever
get around to my unit they will claim it was damaged by ESD so they can keep the $60.00.
Do your homework before buying.