EZDSC Setting Circles from TL Systems

Hi, was just wondering if anybody has used this package from TL Systems...Looking for a inexpensive setup to put on my 12.5 Discovery. I have a PDA and looking to just get the encoders and box to communicate with the pda. They are selling this package for 149 w/software and all hardware. Any help would be appreciated!

http://pw1.netcom.com/~tlsystem/ezdsc.htm

thanks again

James

I know this is an old post, but did you get the EzDSC? I've been using it since 2005, but my directions were destroyed. If you have a copy, could you email or mail a copy to me? Thanks.