I recently bought 3 of them from a board member. The advantages:
30 rounds , better springs that keep consistent pressure even when fully loaded.
Disadvantages: plastic lips and front catch that wear fast (the rear catch is metal insert and will last). They are a bit narrower (left to right) and may rattle on R22s but on 10/22 should be fine.
Conclusion: Stay away from them , get the steel lips !!!!