The Stadler FLIRT series seem to be solid trains based on European reviews. At least one US transit authority has them and there's a YouTube video about them somewhere. They have an odd arrangement where the power car is in the middle of the train with a walk-through hallway. Some people don't like this. The 800's - especially the British Azuma series - suffered some teething pains when first delivered (as pointed out previously by
@jis) and they've received considerable criticism for uncomfortable seating. That could probably be fixed to Amtrak's or specific state's specifications. The 802 series, primarily operated by Trans-Pennine Express, have been better received. All of the above are available as dual-modes.