My opinion hasn't changed from holding off on eSata and waiting for USB3.
Now that I've seen USB3 external enclosures in use, some of which don't even require a power cable when used with notebook (2.5" or smaller) HDDs or SSDs, I think more than ever the best answer for high-speed external enclosures is USB3. The ease of use and predictable reliability of USB remains my preference for those reasons where removable peripherals are concerned.
USB3 enclosures are really good, but not perfect, eSata is still faster coming from a sata native source like HDD, this difference is not huge, but there will always be overheads into changing. One huge advantage of USB is power through the cable, the only issue is not all ports can power all hdds, i would assume that most USB3 ports can power 2.5 hdds, but in the case of the USB2 its not the same, even some enclousures require dual connectors, not saying its a big deal, but its not as simple. I have build my own portable drives with Hitachi 5k500b and Eagleteck mesh 2.5 enclosures, and it works great with this combo, you can power them with one usb2 port and they transfer at the limit for what USB2 is capable, the drives are very quiet, so im happy with them. Recently i bought a Hitachi 5k750 and with the same enclosure i cant power it with 1 cable, with 2 is fine. The only downside of the eagletech is still usb2, so now i just bought a usb3 coolmax 2.5 enclousure, will see if the 5k750 can be used there, my guess is that in usb3 it will be fine, but on usb2 ports ill get the same issue, but just a guess.
Also recently my best friend bought an USB3 toshiba 750 2.5 prebuild and seems to be working great with 1 cable on usb2 n usb3 ports, so in the future i might not bother with enclosures and how they end up being picking depending on the drive and ports.