I guess it depends on your point of view. In terms of hashrate it was a success in getting rid of the sudden peaks in hash rates. The hashrate however is (as expected) much lower in comparison to proportional. The last days we see a very slow increase in hashing rate due to about 1-3 new users a day. But IMHO this is not due to PPLNS but more because of the increasing BTC prices. I got very positive feedback from some users regarding their now more constant overall income. Furthermore the payouts increased slightly for constant miners in comparison to proportional payout scheme. However this is feedback from miners who were eager to change to PPLNS thus this may be a one sided view. Personally I'm quite satified with PPLNS. The biggest difference for me speaking as a pool operator is, that I have the possibility to interact with users giving them hints in order to optimize their mining setup. We achieved several improvements on the pool and on their setups which is very rewarding in a small community. This was not possible with pool hoppers.

However please keep in mind, that MasterPool is no "business". It's a spare time project and fortunately there is no nessecity for me to make profit. My main focus is to build a rewarding community. Having this in mind I have to say: " Yes I'm glad with changing to PPLNS". However this does not mean, that it's the best option for all pools. If I wanted to make profit I guess it would've been better to stay with proportional.