Poor growth at 6 months - I had 2100 grafts of artas robot fue.

Be patient. I typically tell patients not to expect to see much until 6 months. However most of the growth happens between 6-9 months. 

Hello,Let’s clarify all of the information on the ARTAS robot.  Summary is that the ARTAS is the best tool to harvest hair grafts on the market. 
The original ARTAS was slow and took as long as 1 hour to harvest 50 grafts!!  The original iPhone had a 2 megapixel camera and 4gb storage.Since then, the ARTAS is on its 9th version- called the 9x.  With this version, up to 1500 grafts can be harvested in 1 hour!!  The iPhone X has a 12 megapixel camera and a processing chip faster than a high end Macbook pro did in 2007.The point here is that not all robots are the same- it is a piece of technology that has been updated and improved over time just as your iphone has.  Not all robots are 9x (latest version) and their features will be quite different!!In my experience with FUE, the quality of the graft and the graft yield was low.  I believe most handheld FUE are probably in the 60% quality range rather than the 90% being reported.  With the ARTAS, our graft yield has been high 90s which is a huge difference.The ARTAS can actually make sites which is important in patients seeking higher density.  When the ARTAS makes sites it can avoid other hairs preventing 1 type of shock loss.The ARTAS as described is one important tool in the hair making decision.  In my practice, every patient receives regenerative technique (PRP or growth factors), because it makes the results so much better.  In some cases, miniaturized hairs can actually become terminal. The quality of the hair is also better in our experience (using quantitative software with trichoscope, our data) Best Dr. Anil Shah

It can take 6 to 12 months after surgery to see results.  If you are concerned it is best to contact your doctor

I would give it another few months before making the final decision - to be honest, it looks fairly sparse along the hairline and you may need a few more grafts to help fill in and give you the density you would like.  But give it time, while most patients by 6 months we have a pretty good idea on what the hair response and yield will be, sometimes it can take 9 months and even longer.  are you using minoxidil/laser caps/propecia? where were you before the transplant, and how did it look immediately after? there are lots of variables at play here, so keep you head up, and give it a bit more time. 

We normally see the majority of hair growth in the first six months, with some minor increases in hair caliber in the second six months.  Do you have any before photos, and immediately after the procedure photos to show the graft distribution?  It seems the hairline area has come in quite thin, and will likely need additional grafting to blend in with the frontal forelock and mid-scalp hair.