Which Ballast Mounted Solar Panel system to use?

[mikael6]

I am in process of designing a solar panel array for an apartment building that I own. It is in New Britain, CT. Building is 29 feet high and has a flat rubber (epdm) roof that was installed 3 years ago. There are no shading issues. I do not want to penetrate the roof. I have investigated some ballast mount systems for solar panels and I'd like to get feedback on the ones below and any feedback in general about ballast mount systems for solar panels. A mounting system is the final component I need to get for my solar panel array.

Here are the systems I have looked at:

dynoraxx.com
http://www.ecolibriumsolar.com/ecofoot-2 (ecofoot2)

http://www.panelclaw.com

http://www.solsticemanufacturing.com/

[Naptown]

I like and have used the ecolibrium system Quick easy and ideal for EPDM roofs
You do need to leave 6' around the entire perimeter of the roof so if you need to go into that space it will not work.
To give you an idea the first one we did was 72 panels. It took 5 guys 6 hours including carrying the ballast blocks and panels up on the roof by hand.
(However this roof was only 17' high from access point) Running the bonding wires and connecting the modules is not in that time that was only setting panels in place and ballasting them.