ok... I hate to sound ignorant but what exactly is a "string follow bow" ?
String follow, also known as 'set' is a term used by bowyers to describe the amount a bow stays curved after it's unstrung. For example you have a straight limbed bow. You string the bow with a brace height of 7". When you unstrung the bow, it maintains some of the curve that it had while strung. The amount it stays curved is the amount of string follow. The term is used for wood or backed self bows. Some string follow is not bad when creating a bow as it dampens hand shock and quiets a bow, but excessive string follow will rob a bow of cast.
day tripper pretty much summed it up. a string follow bow will be a little slower, but I think they shoot better, and so did howard. HH and northern mist make some string follow bows and Im sure some others do too. you can get glass bows with string follow.