Data recovery starts with working out which kind of problem you actually have, because the two kinds are not remotely alike. A logical failure — deleted files, a formatted card, a corrupted partition, a drive that mounts but shows nothing — leaves the hardware intact and the data usually still physically present. A physical failure — clicking, grinding, a drive that never spins up, an SSD the Mac no longer sees at all — is a hardware problem, and no amount of software will fix it. Diagnosis is free, and we tell you which one you are dealing with before you commit to anything.
Logical recoveries are often done in front of you. We work from a copy wherever we can rather than the original drive, so nothing we do makes the situation worse, and you can see the files reappearing as they are found. Where the drive is healthy enough, this is frequently finished in a single visit and your files come back onto a drive or a machine you already have.