Any recommendations for WAN Optimiser/WAN accelerator products?

[mitchen]

We have a number of remote sites connected via ADSL to the central office.

Many of the users at the remote sites complain of slow network performance.

I was just wondering if anyone out there had any experience of WAN Optimiser/WAN accelerator products?

If so, how useful are they? Which ones would you recommend? What is a rough idea of the cost and the ease of installation etc?

Or any other suggestions for ways of improving performance over the ADSL lines?

Thanks.

[b.hsu]

may be you can try using pots and microfilters in a dsl environment to increase data and voice performance. check the following link for more information :

http://www.cisco.com/en/US/tech/tk175/tk15/technologies_tech_note09186a0080094a17.shtml