I would check the sugar content, then if that is ok, try them. See how your body responds. See if they make you crave carbs or more food in general. If they satisfy you and work in your eating plan then I would say use what works for your body.
Last time we followed SBD, back in 2003, we found the SBD meal replacement bars filling and the taste was ok. They were about 200+ calories each. This go round, we have only been using the SBD cereal bars (100-140 calories each) as a snack or rarely as B-fast. They aren't as filling, but are quick. DH will eat a SBD cereal bar and a boiled egg.
"Blessed is the person who has earned the love of an old dog." Sidney Jeanne Seward