The PAR EndFedz have been great performers at VE3MPG. My first use was at the Manotick Amateur Radio Group’s Field Day in June. I used the EF-40 meter version of the PAR with outstanding results. We threw it up in a tree, tacked the bottom feed point to a stake and the SWR measured flat across the band. We constantly got reports on 40 that "you're the loudest signal on the band here!" In fact this were the comments we got from many of the stations we worked - they included signal reports included with the exchange to let us know how strong we were. My psk station, an FT-950 ran 35 watts all weekend powered by a Honda 2000i generator.
Have just installed my EF-30 PAR EndFed and it tunes up great first time up. The far end is up a white ash tree - 25 feet up and then the feed end is tethered to my support mast.
Make sure that you know your test equipment prior to installing any antenna. My MFJ antenna analyzer was causing all sorts of problems - I was blaming it on the PAR antenna until I ran into the same problem with the 30 meter end fed. Turns out the MFJ-259 had a half dozen cold solder joints and loose ground screws.
The various pictures here show details on my masting - it was constructed from 1" x 1" pressure treated scrap lumber that sat unused in my woodshed for years, glued with exterior grade glue, then screwed together with galvanized screws. Notice that the upper sections are cut at 45 degrees so water or snow doesn't accumulate. Two coats of porch paint then spray painted with Rustoleum silver paint. All the screw countersinks and seams were filled with good quality caulking prior to painting. The mast assembly was then permanently affixed to a large wooden planter. Closed eyehooks complete the mast assembly to support coax and rope attached to the PAR match box. This method takes the weight off the matchbox and prevents the wire from sagging too much.
Tonight I get to try out the 30 meter PAR end fed - stay tuned.