Oh, common, no one is saying nothing concrete about anything, everything are just mere conjectures. I don´t see what are the problems here. But as ppl say, there is no smoke without fire somewhere

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SgtSlottter, thanks for the info. I have read some of these "rumors", and some might have a logical explanation (however some might not):
"2) According to their past statements combined with filings on the SEC site, if you do a little math, their traders make almost no money, which questions their longevity and training, support, etc."
This could be explained easily. If you have no profit, where do you plan to pay your taxes from?
") They merged with Dimension, which had a terrible rep of exploiting newbies who didn't do due diligence and signed up, had a subgroup in queens who disappeared to China with 2 million dollars (some was dimension traders, others were randoms from their community). Also, dimension on numerous occasions was accused of front running their prop traders. I believe they were even sued in arbitration over this (not sure on the lawsuit)."
The front-running issue is more suspicious. This can be possible with your own software (Blackwood?), if the system itself is build like a big internalizator as the majority of Forex bucket shop software.
"Fusion, the software WTS bought in the dimension deal, is consistently one of the least reliable software platform's in the industry, probably because it is just a renamed Blackwood Pro, which was built in 1999 or 2000. "
Tried it back in 2008, it´s not so awful, some things where awful, some nice and even sterling doesn´t have them. It´s just that it was made for other purposes I think, however , i do not trust software that has full "demo" capabilities (including quotes, etc). For the same reason that the previous comment.
5) they subscribe big time to the sub-group model, which leads to questions you should get answered about someone else or a different group blowing up and how it effects you.
I traded with other prop firms, and WTS is not the only one out there using this model. HB for example.
7) you mentioned 'internalization' - there is a lot of speculation they just cross their internal orders. This is not good, since there is a delay. when stocks are moving, the last thing you want are fancy routes, you just want to be able to get the stock on the box.
I think their dark routes deal a lot with this, crossing their own traders orders. I would like to see WTS rule 606 reports about their order routing.
8) one other rumor is that they spread any strategy from their US traders if they land a decent fish to traders in their much bigger overseas arm. the risk is you walk out of there without the edge you walked in with.
This risk is the same in every prop firm. I bet you that Bright,echo,chimera, etc have this thing happening. It´s called "team work" lol.
9) no one has ever answered the question about their Class A member capital versus Class B capital. Meaning, if a trader blows up, do the owners have any cushion in there before your money gets blown up proportionally. This would be a question to ask in writing to WTS or any other firm.
Would like to hear about this too.