I came across the following link which does a pretty good job of describing the Canadian approach to gathering information for their upcoming proposal to acquire OPVs. You will see that they have a comparison list of OPVs curently in service with other navies one of which happens to be our very own Roisin class which gets a very good grade. They also list the Emer and Eithne classes but they only show a picture of the Roisin. Interestingly they speak very highly of the smaller Icelandic vessels too even though they don't meet their need for larger vessels which need to be able to house a helicoptor.
http://www.sfu.ca/casr/101-navopv.htm
http://www.sfu.ca/casr/101-navopv.htm
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