Ask for illustration with GUARANTEED results - If you tell them you are expecting to withdraw $$ when you are 60 years old and you are already 50 years old now, see the results :>)
If something is too good to be true then it is not true. Too many sales only tell you the good side of story (worse yet, with tons of assumptions). Put some effort to study the products; at least go with the sales who have been in business for 10+ years to be safe.