I recently bought through Gibbs Gillespie and sold through another agent.
After experiencing their service when buying I am firmly of the belief that the biggest mistake I made in the whole process was not utilising them to sell.
The whole experience of Gibbs Gillespie was a positive one - they couldn't be more supportive even when things within the chain became difficult - it's at times when the chips are down that you either see the best or the worst in estate agents and difficult times were not anything that Gibbs Gillespie hid from.
Customer service was first class regardless of who you spoke to or dealt with at the branch.
The other really positive thing about Gibbs is their network of ancillary services - they don't force them down your throat, but offer them as assistance if required - a refreshing approach to ancillary services such as removal companies, solicitors and mortgage advisors.
Overall a first class company that I would recommend.