Cheap Echo is NOT pro grade. Pro grade is pro grade - big box store products are not pro grade OPE. Echo was the first pro grade OPE company to sell out to a price point in a big box retailer to increase market share and it really hurt their reputation around me... no pros touch them here.
We don't have space or time to store assembled units (or assembled in the box) until a customer makes a purchase... it's all out on the floor and all setup by the same staff who have been doing that job for years in house. Stihl has a certification class for it online now...I'm the only employee new enough to need the online portion, they all predate it in their training.
So far I don't see demos in our store or market, but all dealers can do that if they choose. You can't, as was said, paint all company dealers in the same light - we're all different and we're all independent. That's kind of the point. Occasionally some customer is going to come in looking for a part for their beloved OPE that we simply don't sell enough of to justify stocking...sorry, need to order it. Occasionally it takes time to build an order high enough to hit minimums with your vendors...and if you need it fast you pay the shipping since it costs more than waiting. A week isn't all that bad in many cases - we have 1 major vendor I'm lucky to see enough to order from in a month... and they carry major brands parts so sometimes it hurts.
You also have to expect occasionally you might need a part that was just sold out in a local store, or may be on back order from the vendor or manufacturer... chainsaws and air filters are not exempt from that. I'm waiting for a connecting rod for my snow blower's Tecumseh which has been on back order since the beginning of Feb from my vendor and likely from the OEM to them. Wrist pin clips were in hand in 2 weeks, head gasket in a couple days...
FWIW, I work on both orange brands and while I think both are quality machines when the correct choice is made for the intended application I definitely see how one company is much harder to service (at least in saws of all kinds) going back from new to old, and how different the quality and volume of service information and support is from both of them. I've received more and better information from Arborsite than from the Swedes, and we're dealers for both.