Just read the review sections. People there have no problem blasting a plugin if it's crap ... lol
Actually, it's fairly rare. Don't worry so much.
Pretty unlikely if you get it from the Wordpress depository ... just don't use pirated or nulled plugins from elsewhere.
In that case ... use the Original plugin ... it has most of the basic "plugins" built in.
Thanks for the tips, I guess you're right - and absolutely correct about 'nulled plugins' ...
& yup, always do read the reviews & will keep an eye on this all - thanks for tips