Yes, have used a couple of TCS T1-HW decoders in small G scale locos. Seem perfectly reasonable decoders for the money I paid. I liked the idea of the T1-HW as a shrink-wrapped compact size decoder with a plug-in connector and with enough power handling for a small loco (1.3 amp continuous, 2 amp peak).
I`ve not tried their G scale decoder as yet.
One of the T1s went into a Playmobil motor block, with a little of the metal weight cut way to make space at one end of the block
The other`s powering this old Kalamazoo 4-4-0 (again the decoder fitted inside the motor block)