Reliablilty is great on my OS TR-T. The standard head version is a little less than $150 and for a little more $$ you can get the turbo version. OS is also releasing a TR R spec soon which will probably be closer to $200. Either way this engine will move pretty well and tuning and reliability have been great as usual with OS. Is it as fast as a Novarossi or Sirio? No. But it can hold it's own and it's priced in the range you mentioned