Exactly what antennas are wired to the W3LPL skimmer, I'm not always sure.
I'm physically close to W3LPL and on 40M and 80M, where I have a pretty good antenna, I can very often hear what his skimmer antenna is spotting. His spots are very very useful to me. Clearly his antennas are better but if his skimmer is copying uncommon DX, I have a very good chance of copying it by ear.
On 10/15/20 and 160, where my antennas are clearly inferior, it's more hit or miss, sure. But still worth checking it out.