Quote from mtzianos:
In addition, many API-front-ends don't support custom offset for STPLMT, which makes e.g. useless for markets like mini-oil (QM).
You can look at ButtonTrader which will always work. It even has code in it for monitoring not functioning Stop-orders, and will intervene when it does not function, and correct it immediately.
ZLT seems stable and it is beyond cheap.