In my market they sell for $300 less than a 346. They come with a 5 year consumer/2 year pro warranty. Power wise they are a torque saw. To me they feel like the old Sachs Dolmar 115si in terms of power.
I have started a long term test on one. I am shooting for 1000 tanks through it. Sitting at 426 now. Will continue when winter is over. One thing I don't like about Efco is that they offer no heated handle models.
The 152 when set at 13,000-13,500 will block with a 346 (45cc). Try to turn the 152 in the 14,500 range and power drops off.
The 152 is not listed as a pro saw, but is capable of pro work.
I am going to port the test saw soon.