This is going to be a quick flyover of the pros and cons of different aspects of Gummy Bear breast implants (medically referred to as highly-cohesive silicone gel). For the sake of brevity and impartiality, I will withhold my personal opinions on which implant I feel is best.
Similar to saline, Gummy Bear breast implants have a firmer feel than cohesive silicone gel breast implants because the silicone is much higher in cohesiveness.
Currently, almost all Gummy Bear breast implants are anatomical shaped which will give a much more natural look than round saline or silicone gel implants.
Since Gummy Bear implants are pre-filled, they typically require a 1.75" to 2.25" incision.
Again, without getting into whether or not silicone implants are safe or not, the silicone in Gummy Bear breast implants have a much high cohesiveness than cohesive gel implants. Therefore, they have a lower likelihood of toxicity—yet not as low as saline.
Gummy bear implant types don't currently come in as high of fill volumes as saline breast implants do, typically ranging from 140cc's to 740cc's.
Due to their high-cohesive gel, it's extremely rare for a women to find a rupture on her own. Similar to silicone gel breast implants, an MRI is almost always required to confirm a rupture.
Most Common Complication
The most common complication with Gummy Bear breast implants is the same as with silicone gel implants: capsular contracture. This is where the capsule that forms below the implant become hard and squeezes the implant. This can cause it to look or feel hard and distorted, and depending on what grade it is (1 through 4), a revision breast surgery is likely.
Gummy Bear breast implants typically run about $1,000 more than saline implants.