Their implementation was seamless from start to finish! They were always available when we needed help or clarification as well as providing any additional resources our questions might have required in order to complete this project successfully - I could not ask enough of them during my time with these guys!! We are now tracking all parts/items through each stage (from purchase request until delivery) so there has been no loss / misplacement at ANY point along this journey which would otherwise cause many issues if they did occur..
The only downside i can see right off hand with regards to anything else about gocomet themselves but nothing major just something you may want to consider before signing up however minor things do happen sometimes even once great implementations such as google cloud etc. It's hard to think of really what other downsides one could face on implementing an app like GCM though everything seems very smooth especially considering how fast.