At the most recent Mile High DX club meeting I met Barry K0XE. He had a small pile of QSL cards with him and he was getting the cards checked off by an ARRL card checker. I glanced over the cards and I saw E30TA. I asked him if I could take a picture of it so that I could share it with my friends. He said no problem. I also saw other goodies such as EZ3A, EZ8CW, and 5A1A. Needless to say all these entities are very difficult to work however they were relatively easy a decade ago.
In 2001, E30NA wasn't all that hard to work, and I think I got him with one or two calls, likely before the end of the DXpedition. I'm guessing it was probably no different than an E4 today. EZ was also on all the time and they were just as easy as the surrounding entities. 5A1A was before my time, but there was a big operation from there back in November 2006 (5A7A), and they were pretty easy from the east coast after the first 4 or 5 days. I even got 'em on 160 (my best catch ever on Topband). It's 80% about being there (with at least 500W and a modest antenna) when the rare ones are QRV.