Overhead Storage Rack recommendations

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I'm interested in installing some overhead "loft style" steel storage racks in my garage and have been looking at various different companies regarding the different products they offer. I've settled on a 4' x 8' rack with a capacity in and around 600lbs.

Can anyone post reviews on companies they've used or which ones are recommended.

I've looked at the following companies:

http://www.tuffrax.com/

http://www.monsterrax.com/

http://www.saferacks.com/

http://www.onrax.com/

http://www.overheadshelf.com/index.html

http://www.americangaragesupply.com/...-48-x96-1.html

Any preferances among the forum members?