I only started recently and bought the Lutin as an alternative to the Hawimk bugpin. It is so smooth with the brushless motor, and includes spare parts and small zippered EVA case as well. I like it so much, I ordered the Ambition Korall power supply which is amazing as well.
Pros
Small size at just 3.14" and 4 oz makes it easy to manipulate
Virtually silent with little vibration due to brushless and coreless motor
Size and weight makes it much easier to do detailed work and smooth lines
Cons
None that I can find so far after 2 months of use
I am considering buying a second in black or the Torped next
I really like the Korall power unit combination but may try the Kuark next
I am very impressed with the quality and workmanship of this unit and Ambition as a manufacturer and therefore recommend this unit