The previous review are all super good, so instead, I will add some synergies that are fun to play with.
First is with Tāo Salonga: Telepresence Magician. Most corp won't put an ice on archive against Tāo Salonga: Telepresence Magician, because their most potent ice will be sure to move to archive. Once Tāo Salonga: Telepresence Magician put Sneakdoor Beta on the board, there will be many run possible using it, until the corp put an ice on archive. Then, just play as normal knowing you just forked the corp and got to see HQ a bunch of time. This is a game winning strategy.
Second is with Rejig. Early or late, once you put Sneakdoor Beta, you will get a few run out of it before the corp ice up archive. At which point, you can use Rejig to uninstall Sneakdoor Beta and install SOMETHING ELSE for 4 less (and freeing ). On top of it, you will still have Sneakdoor Beta in hand if it could come in handy.
Otherwise, the mere fact of forcing the corp to ice up archive (especially if you have a Docklands Pass installed). You can for the corp to rez its archive ices. Then stop using Sneakdoor Beta and hammer anything else (which is now less iced). But you already understood that.
This card is one of the few game changing non breaker program of the game. It is well worth the investment. Nice graphic and quote too!