I have seen advertisments for an anatomical teardrop shaped implant. Is that really worth the extra cost?

In most cosmetic augmentations the answer is usually no. The tear drop implant is very useful for reconstruction after cancer, or in older patients who don’t want fill in the upper half of the breast. The implants can rotate, leaving the bigger part of the implant on one side, and distorting the breast shape, where as with round implants it doesn’t matter if they spin. A round implant will recreate the fill in the upper breast, which is one of the most common goals of women seeking enlargement.