The most useful feature is that I can use it to create my own custom audience segments with very granular targeting options (e.g., by zip code). It also has some other features like remarketing lists which are nice but not necessary in our case as we don't have any need of those yet. For now there isn’t anything really annoying about this tool so far; however if you do want an easy way to segment your data without having complicated tools then go ahead! We're using Britepool mainly because they offer free trial period where all their advanced functionality becomes available right away - otherwise we would've needed more time/effort setting up things ourselves before starting actual campaigns. They support both FB pixel & GA tags too which makes life easier when integrating them into AdWords accounts or creating Custom Audiences from Facebook Ads Manager reports.