Well, the iHiFi 770 has arrived and it is very nice. For all of you that own a Xuelin player (760, 812v2 or 960), this player is markedly different in size, but it still retains the beautiful Xuelin sound quality. The 770 is thin and sleek and really is an attractive music player. It is about the same size as the Sflo2 (which I think is about the same size as an iphone). It is quite light-weight; it does not feel as sturdy as the 960 but it does feel solidly built. I have the iHiFi 960 (dual-core version) and from I can tell so far, the 770 rivals it in sound quality. The 960 has a wider sound stage, has a slightly warmer sound quality and is a bit better with microdetail, but the sound quality of the 770 (to my ears anyway) is very, very good. The 770 has 2 head-phone lines out (but no dedicated line out), and the sound quality is noticeably different between the two. The headphone A port (referred to as "voice" or soft mode by Xuelin) is a bit recessed, and has a bit more base than headphone B (referred to as "elegant and beautiful"). There is enough difference between the two that I prefer different earphones with them. For headphone A, I prefer to use Westone 2 and Ostry KC06; for headphone B, I prefer zero audio tenore. For any of you that have the Colorfly C3/C&C BH amp combination, the two outputs on the C&C amp are very similar to the head phone ports on the 770; Out 1 on the C&C is similar to headphone B, and out 2 is similar to headphone A.
The 770 has much more power than I expected; the volume settings range from 0 to 60, and with my available earphones, I have not needed to go above a setting of 35, and I tend to listen to music a bit on the louder side. Again referring to the Colorfly C3, the 770 has more power and is much quieter, the 770 has an absolutely black background and there are no pops/clicks between songs or when the player is turned off. The sound quality of the 770 (at least for me) exceeds that of the C3/C&C BH combo. It is also easier to carry around as I don't need an amplifier. I recently read another review (translated from a Chinese forum) in which the reviewer thought the sound quality of the 770 exceeded that of the FiiO X3, but not the FiiO X5. I don't have either FiiO player, so I cannot comment on this any further...
Navigation on the 770 does take some practice, but the firmware is identical to that on the dual-core 960 (version 1.80). You just have to get used to the key sequences to maneuver between the files. The 770 has all the UI features that the 960 has, but instead of physical buttons or a volume knob, the 770 has touch screen "buttons" to make selections and adjust the volume. The touch screen buttons on my unit are appropriately responsive and the player is quite adept at changing between songs, with no significant lag or delay. To be honest, I do prefer the 960 when it comes to maneuvering the player/volume control, but the 770 is rapidly becoming more familiar as I get more parctice with it.
The 770 is supposed to have a battery life of around 13 hrs; I haven't listened to mine long enough to say if this is accurate or not. The 770 does (in my opinion) have a feature that is more convenient compared to the 960. The battery of the 770 can be recharged thru the same USB port that is used to transfer music to the player, whereas, the 960 has separate recharge and USB ports. This will increase the portability of the 770 for me and make it an easier player to use at the office, in the car, etc. The player has 8 gb internal memory and has a microsd slot said to accomodate cards up to 128 gb. I am using a 64 gb card and the player reads it quite well and quite fast.
So, in summary, I think the 770 is a very nice player with excellent sound quality (if you like the Xuelin sound). It has an absolute black background with no noise/pops/clicks between songs or when the player is turned off. The player is smaller than the other Xuelin offerings today, and in my opinion, it is a sleek, attractive player. The 2 headphone outs offer the user a reasonable choice based on the earphones/headphones the user has. The player has enough power to easily drive all the earphones I currently own. The firmware on the 770 does have preset equalizer settings (I am just using normal, like I do on the 960), so this may help some users. At this point, I do not see the need for an amp for my purposes with this player. The touch screen navigation does take some practice to get used to, but is not complicated. All in all, I am quite happy with the 770 thus far, and I think it will meet my purposes quite nicely. I purchased my Xuelin 770 from Penon Audio; the player comes with a USB cable, a user's manual and a protective leather case. I paid US $180, and this included shipping.