So the 2018s are still the 'current' model for Bulls.  Based on good reviews here, i ordered a brand new E-stream Evo 2 27.5 Plus hard tail which is supposed to be delivered in 10 days.  I was just told that contains the old, pre-2017 Brose T Drive engine??  The S Drive came out in late 2017 to be included on "all 2018 models".  Is this correct?  Is the difference big enough to look at a different model or wait 60 days for the 2019 models to come in?  Ive read about engine failure with Bulls and Ts.