I bought a Helmsman controller in January 2008 after the H&DLR v2 was built. This was upgraded with a radio remote control in 2018 along with a repair to the main controller. Last year it was apparent that there were malfunctions occurring with the Helmsman that have become more persistent this year. There's a significant voltage swing around 6v, which is the starting voltage for many locomotives, and which is likely to damage the onboard electronics on newer models. Additionally, from time to time, when the speed is set back down to zero, the locomotive continues to run. This tends to result in a mad dash into the shed to switch the power off at the mains. Disappointingly, Peco, who inherited the Helmsman business, state that they cannot repair the G Scale controllers as they don't have the parts.
I therefore bought an analogue Piko 35002 controller and their 35000 5A transformer, which is an absolute brick of a thing and can be used with their digital controller as well. The controller has proved to be very smooth and effective.
The next stage in the evolution of the system is to add a remote control. This can be done by adding the Piko radio receiver, which can control the analogue controller, and a handheld navigator. The latter is, of course, designed to be used with a digital control system and using it on analogue is somewhat overkill. Nevertheless, it works, and who knows what the future might hold. Given that all LGB locomotives are now digital with sound, it would make sense to be able to manage and control those additional functions especially since LGB's approach to analogue functionality can best be described as "we couldn't care less".