I'm not exiting OpenQuant, I am finding it decent and plan to continue to use it. It does a nice job of bridging the gap from backtesting -> paper trading -> live trading. It's got enough structure placed around it in areas such as data collection, charting, performance measurement etc... I was a bit overwhelmed by the amount of flexibility (aka lack of structure) that TradeLink exposed, and I'm relatively novice at .NET development so I prefer something a bit more contained. This is not implying that TL would be complex for others with more experience.
I like the idea of TradeLink being lighter footprint, and more flexible. There are some clumsy approaches required in OQ to trade multiple symbols in a portfolio (pairs trading) and I like the idea of being able to build a software stack that could, in the future, be independent of a 3rd party vendor.
It seems like TL is very similar in the basic framework of events (GotTick instead of OnQuote) etc... so I'm hopeful that TL would be a good execution platform once I've gotten everything running the way I'd like
Feel free to PM for more detail.