dimension is QBP’s house-brand. they are cheap, and come in any size ya need. made in china or god-knows-where, probably by enslaved 7 year olds - the same ones who make 90% of tri-bikes. i use em on occasion ( the stems, not the 7 year olds . . . ) , and they seem to hold the handlebars in one place just fine. i wouldn’t put on on a vanilla, but if you ride a generic pacific rim whatever frame why the hell not ?
You get what you pay for with a dimension stem. The steerer tube clamp on them tends to be pretty tall. It’s about 4 cm on a ritchey, probably closer to 6 on a dimension, but I don’t have one in front of me to measure. If you’re buying this stem to go low in front, you’re probably better off with a ritchey.
From an engineering (materials science) standpoint, I feel more comfortable and confident on a stem that features a 4 bolt handlebar retainer like the Ritchey or Oval.