1. Best is to check all vendors for RAC1 antibody and see what the market offers. You could start searching in Biocompare.com to identify all commercial RAC1 antibodies. Check the products sheets from the catalogues so you know how the antibodies were generated and what QC data are presented. 

2. Go for a reliable vendor with substantial information about the antibody on offer. The choice between monoclonal and polyclonal antibody depends on your requirements. See also http://f1000research.com/articles/3-232/v2 for practical tips.

3. If you cannot find a good working RAC1 antibody (after trying a few), you need to decide to have one custom made, see http://everestbiotech.com/custom-antibody-promotion/ for the best deal.

4. Trustworthiness needs to be earned by offering refund when the product does not perform according to the product sheet's specifications.

yes, I worked with this antibody in my post doc and it works very good. it was good for western blots and also for IF

thanks very very much for the valuable informations. I appreciate it.

The best Rac1 antibody is a mouse monoclonal from BD, cat#610650

thank you for the feedback!

Rac1 antibody from Cytoskeleton works fine but the best I used so far is the Anti-Rac1, clone 23A8 from EMD Millipore.

Cheers