Surge Protector - Brick Wall/Zero Surge vs SurgeX


I am planning to buy a Surge Protector for my audio equipment. I have shortlisted the following:

Brick Wall PW8R15AUD ($259.00)
Zero Surge 8R15T-I ($286.00)
SurgeX SA1810 ($355.00)

I have heard that the Brick Wall and Zero Surge are clones and they claim to have isolated (duplex) receptacles to prevent interference and cross-talk. SurgeX claims to have better filtering.

Do they have any detrimental effect on sound? Has anyone heard them and compared them?
bssk
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I have been told on very good authority that Surge X initially developed the technology and licences it to Brick Wall. On the advice of some recording engineers and audio professionals who can not afford unnecessary downtime, I have used Surge X equipment in my audio system for more than 10 years. I use Brick Wall for all of my television sets.
Also look at the PS Audio Quintet, it is $399 and offers some extra features over the Brick Wall [I have both] One important thing for me is that it uses a detachable power cord vs the Brick Walls captive one. I just got my PS but my first impressions is that I prefer it.
Zero Surge sell the technology to Brick Wall and others. If you read the patents it's pretty clear that they do.

I will say that you should go to the Zero Surge website and look under "What's New" and take a look at the current special. Pretty hard to beat IMO. Also, for first time customers they offer a 20% discount.

I started a thread on another forum that's the only reason I know this.