Not sure. The TC-DC52 is quite new in the market, so I have not seen any comments or comparisons posted on other forums yet. I do know that this converter has a rather small rear element. That means that it will most likely work only at full zoom without vignetting.
That in turn imply that your combined available focal lengths are not continuous from 35~252mm (assuming the coversion ration is indeed 2.4X). You get your 35~105mm without the converter, and then a limited range at 252mm. You will not get 150mm focal range because of vignetting.
If you can still get your hands on an Olympus B300, then that might be another worthwhile alternative. The conversion is 1.7X, and you should get a larger zoom range without vignetting.