The T500 boiler and copper alembic dome is a solid combo for the home distiller. In this configuration, it becomes a pot still suitable for making whiskey or rum. Its also a great option for the final botanical run for a gin.
Even if you end up upgrading to a larger (50 - 100L) still you will likely find a simple pot still of this size useful. It would give you sizing options which are always helpful.
Adding a BIAD bag the T500 boiler can also be used as a makeshift mash tun. This lets you make all-grain whiskey without additional mashing equipment. In fact, Jesse has a whole series of recipes called "Safety Net" doing just that. Check them out here:
The T500 boiler also fits the T500 reflux head that is sold separately.
Jesse suggests adding a power controller to this combination as the first upgrade. We currently do not have anything suitable for sale. We are working on it! Checking the forums for build options is a good place to start looking for a DIY solution.