The I series are paying up to 8 per cent or so, depending on when they were issued. Not too bad.
I have a Treasury Direct account. They had a glitch the other day, locked everybody out for a day. Nice.
The marketable securities - (savings bonds can’t be sold, of course) there is no provision to sell them before maturity. That is, not Direct to the Treasury. They have to be transferred to a broker, that involves paperwork, bank official certification, etc.
If you want to buy short term securities and hold till maturity, it’s an OK setup. At least there’s no charge or commissions.