depends.
in portugal, great majority (that i've seen) has
these, or
these.
alot cheaper. full kit (AC,Alpha, etc) costs about half a reserator kit.
not successful.
note that bi rads were, for a long period of time, here, very expensive.
not anymore (thankfully).
not a general consensus ?
good, yet quiet*, at least?
still, "good" can mean
sufficient in most cases, not particulary efficient.
winner there.
* with all relativity.