Every so often I go through holdem manager and see what the best players are doing at the stakes that I play. I've come across a player who I always thought has a decent understanding of the game despite playing 31/9. Turns out they're the biggest winner over a large sample for this year (5/10 to 25/50).

This player limps their whole range in EP, MP, CO and seems to play conventionally OTB.

LimpF 38%, LC 44%, LRR 18%

By limping they seem to be playing an extra 40% of hands. 

What are your thoughts on this playing style? It's a strategy that's hard to ignore given their results.