People don't like Silercershop as they were the ones who were doing "batch processing" of Form 3's (sending 1000 forms in at a time) and it ruined it for everyone else. Their mentality was -they found a way to work within the system, not doing anything illegal, it's just business.
They're not untrustworthy.
I suggested Colonial Armory. Steve was a Ranger and will treat .mil folks well (even if they didn't retire and just got out). I'd recommend anyone in the market to at least check his prices. (
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Form 3's are taking about 30-45 days
Form 4's are about 4 months. The last one I had approved was sent 3DEC14 and approved 5MAR15. They did delay sending the paperwork as it arrived 20MAR.
For the last several months, 4 months is about the norm.
Transfer cost vary from low end of NFA item $35 to high end $100-110 per item. I think $50 is a fair cost. Another thing to consider is if you're buying several cans over the next year or so, let the dealer know, he may give you a brake. I once bought three cans and the dealer charged me $100 per can even though the transfer took place at the same time. Many dealers will set one price for first transfer then reduce for additional transfers to encourage future business.
Make sure you make arrangements with the local FFL/SOT and ensure he knows the items are coming.