No satisfaction guarantee is a deal breaker

[dennisthex10]

     Purchasing wireless devices and assuming their transmission capabilities will be satisfactory in all environments, I feel, is a very risky investment.

[dave w]

You are right, but I don't agree that it should be deal breaker. If you want the gizmo, you take the risk assuming interference problems can be mitigated. OR you buy the device from a "satisfaction guarenteed" vendor, such as Best Buy, Sams Club, etc. Even these vendors are beginning to charge restocking fees for returns that are working. The 2.4 GHz band is now becoming crowded with dozens of Bluetooth and WiFi devices. And it ain't gonna get no better.
However, it is a good warning.   

[X10 Repair Depot]

    Purchasing wireless devices and assuming their transmission capabilities will be satisfactory in all environments, I feel, is a very risky investment.

Can you please elaborate on your concern? We do offer a return policy:

Return policy: May be returned for a refund within 21 days of purchase. All non defective opened AirSights' are subject to a 15% restocking fee. Additionally, AirSight comes with a 90 Day Repair & Replace Warranty.

[Linderhof]

But the consumer bears the cost of shipping the defective product back to X10.

[dave w]

But the consumer bears the cost of shipping the defective product back to X10.

That isn't usual for any catalog/on-line company.

[Linderhof]

If you request an RMA within 21 days of purchase, you then have 30 more days to return the product.  Any deviation by X10 from this posted policy would be an aggregious violation of consumer protection laws.

[dave w]

If you request an RMA within 21 days of purchase, you then have 30 more days to return the product.  Any deviation by X10 from this posted policy would be an aggregious violation of consumer protection laws.

Sorry, I had a typo in my August 29 post.  
Let me restate: Like it or not, customer return merchandise shipping costs (and / or restocking fee) is becoming the norm everywhere I look. The OP talked about external interference.  X10 has no control over external interference, hence has little initiative to absorb return shipping cost, other than consumer good will.