This season I added 12 of the new Troyer Vertical Gourds to my colony. I am also using Troyer Horizontals with tunnel/porches, Troyer Horizontals with cling plates, Super Gourds and Excluder Gourds.
As of April 9, 2010, there are 11 ASY pairs of martins in my Troyer Verticals and the remaining one is being dominated with several other gourds by a possessive male martin. I am really pleased with the Troyer Verticals and will most likely use more of them next season. I posted an in-depth review of this gourd on the Forum and here is a link to that article:
http://purplemartin.org/forum/viewtopic.php?t=15120
If you haven’t tried the new Troyer Vertical Gourd, I would recommend these high quality opaque gourds. They come with a tunnel/porch and are constructed from dense plastic. A really fine product! You can order these gourds through the PMCA’s online shop.
Steve
Here are two photos of Troyer Verticals with martins in residence.
This photo shows an ASY female martin sitting on the porch of a Troyer Vertical. All my Troyer Verticals swing from side to side which is what I prefer for gourds with tunnels. This keeps the gourds from tipping down in the front. All my regular verticals like Super Gourds and Excluders swing front to back. I also drilled four vent holes under the neck canopies in the top of the Troyer Vertical.

This photo shows an ASY male martin sitting on the porch of a Troyer Vertical.

