The best thing about link sense is that they are constantly adding new features to their platform, which makes it very useful for our clients' needs! They also have great customer service reps who respond really quickly when you email them with questions or concerns regarding your account/data privacy etc..
I've never had an issue while working through my client's accounts (so far). It could be better if there were some sort of integration between this product & other similar software products so we can share data across platforms easily - but not at all necessary just something i'd like :) Definitely use these guys!! Their team has helped us grow by leaps in terms of getting installs from within apps as well helping track how many people actually open emails vs read content inside those messages / click buttons before closing out without reading any information whatsoever haha :P.