What are the pros and cons of using mesh to fix and further prevent bottoming out? (Photo)

I am sorry to hear about the complication you have experienced.
I think your concerns are appropriate; your breast implant does seem to sit quite low on your chest wall, consistent with breast implant displacement ("bottoming out”).
I think you will benefit from revisionary breast surgery which will likely involve capsulorraphy ( internal suture repair). This procedure serves to reconstruct the lower poles of the breasts and prevent migration of the breast implants too far inferiorly. Associated issues with positioning of nipple/areola complexes should improve with this operation.
Generally speaking, the use of acellular dermal matrix or bio synthetic mesh for patients in your situation may be helpful occasionally. This material may be helpful as a supportive matrix and help with the breast implant displacement/malposition you are experiencing. I usually recommend their use depending on the patient's anatomy ( for example quality/elasticity of the involved skin) and past surgical history.  You may find more information about specific pro's and con's on the Mesh manufacturer website.
You may find the attached link, dedicated to revisionary breast surgery (demonstrating many cases of corrective surgery for patients with "bottoming out" of breast implants) helpful to you as you learn more.
Best wishes.

Repositioning a malpositioned implant can be a challenging process, especially in a case as significant as yours. There are many variables that can lead to this problem -- implant size, soft tissue strength, implant texture, and surgical technique all contribute to final position.  You appear to have a reasonably large implant and to have undergone some sort of lift at the time of your original surgery, so I will presume that your tissues are fairly soft and their strength compromised.  In cases like this, the placement of some type of supporting material can help reduce the risk of recurrent malposition.  Products like Strattice, Flex HD, etc are collagen meshes made from various animals.  Other materials can be used, as well.  SERI is made from silk, for example.  In all cases, the benefits are better support for the implant long-term and perhaps better soft-tissue coverage to hide rippling and palpability.  The downsides are not insignificant, however.  These products are expensive and challenging to use correctly.  They add to surgical complexity and operative time, and can introduce other deformities if not expertly placed.  I would also state with relative assurance that your skin envelopes are very different, and that some sort of mastopexy will be necessary at the time of implant repositioning.Of note, it appears in your photo that your right breast is significantly larger as well as being lower.  If this is actually the case, you may have fluid around your implant which can further complicate matters.Make sure that your surgeon has extensive experience with complex revisions, as yours is not an easy case, but with proper care you should be able to achieve a significant improvement in breast shape and symmetry.