Need some material about wireless equipment

hi every one.

i think i can ask question about wireless equipment on this fourm.
i need a comparative technical study and user reviews about and between the following wireless equipment.

1) Orthogon Gemini
2) Wi-lan 3 (CR/Rd)
3) Aperto 600 and 1000.

i shall be very thank full if any one help me or give me the material i need or send me the links from where i can fine my desire information.

thanking an praying for u all

take care

bye.