I didn't receive one of the 200 test samples, but in looking over the notes and watching the videos I'll suggest that getting flywheels in place so that the engine is able to coast would be a critical upgrade. If the intention is to get folks to pick up a locomotive at a very reasonable price for their kids to run, that screeching halt with younger children will lead to unhappiness (read derailments). As anecdotal evidence, I collect AMT/KMT F units from the 50s that stop dead in their tracks when power is cut - they can pull stumps due to their weight/traction tires, but there's zero coasting ability which frustrated my young son when he tried running them. We had a number of modern diesels with flywheels which enabled coasts to the stopping point when power was cut which he'd run successfully (and greatly reduced the number of derailed cars that inevitably piled up when running the non-coasting power). I'd also add that being able to run the engines conventionally would be a worthwhile addition - as it stands, it appears the engine won't move if the remote isn't used - broken remotes will lead to unhappy engineers if they can't run their engines at all.
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