Just as a datapoint for new(er)-comers to this pool like myself: my earnings are approximately 19% higher over the last 6 days through middlecoin than they would have mining with wemineltc.

My calculations are based on:

• the current LTC difficulty of 3366.694 (I realize the difficulty has increased)
• a 2% reject rate at wemineltc (and I average 4-5% rejects with middlecoin since the server update)
• 1% pool fee to wemineltc
• a 0.2% trading fee at btc-e

Higher earnings and less hassle trading LTC->BTC. I'm pretty satisfied with middlecoin thus far, especially after the server fixes this weekend.