Opinions on CJ ET2 and PV-11L

These CJ preamp models appear to be reasonably priced in the used market and I'm looking for opinions from folks who are familiar with these particular models. My current preamp is a NAD C165BEE which I think sounds quite decent but I'm intrigued by tube preamps and the CJ brand in particular. Wondering if these models would be an upgrade or I should consider better models in the CJ line up. Thanks.