I enjoyed the day that Kevin and Tracie installed my pot lights and dimmers. Once my other lamps came in and I installed LED light bulbs, I noticed that they flickered. After some investigation with the light, bulb and dimmer websites, it was stated that the dimmers, installed by Stack, were not compatible with LED lights, in fact it was printed on the dimmers that they were for incandescent bulbs only. Kevin refused to change them and so, needing another knowledge source, I got help and advocacy from an ESA inspector. I ended up having to purchase and install the correct dimmers myself after Stack reimbursed me for the correct dimmers that Kevin provided but refused to install.
I was quite fond of both Kevin and Tracie and think they will do good work. My advise is to be clear with them that you may be using CFL or LED lighting and that approved dimmers are installed and that they must have and be able to install the correct switch cover plate on your light switch(es) since my 3-gang box was initially installed too far back from the drywall and not happily corrected. Also, ensure that the ESA inspector does visit and inspect the work as this safety function is vital and included in your quote.