The team at effective spend are fantastic to work with! They listen well, get things done quickly and always have your best interests at heart - without question they're amongst my favourite companies out there right now for PPC management/optimisation etc.
I've worked closely with them during their recent rebranding project too which was great fun as we both realised how different our styles were but got along really nicely. Nothing so far that's particularly dislikeable about working or being associated with this particular business. We use it on all of our campaigns across numerous channels including Google Adwords, Bing Ads & Facebook Advertising where we manage budgets / bids from within the platform itself rather than via third party tools such as GA360 (which can be difficult).