I bought the 2degrees bundle (packaged with sim etc) at the Warehouse. It is single sim but has the multi-sim menu options. (I accidentally turned off the sim, and it took me a while to figure out why the phone wasn't working and what I'd done). Model on the box is listed at Y320-U10.
It has no compass or angle sensors if that is of any interest to you. Ringer and speaker phone aren't overly loud. Battery life is pretty good. I can go 3 days without charging. Processor and GPU are pretty good for a budget phone - it scores 10453 on Antutu bench mark.
One thing you should know about these phones before buying one is that the touch screen is extremely sensitive. I thought mine was faulty, took it back and swapped it, but the replacement is the same. When you give the screen the tiniest, slowest flick it rockets away down the page. The scrolling appears to accelerate after you lift your finger. For instance in the settings menu, the tiniest, tiniest little flick you can possibly do will still cause it to crash into the bottom of the menu. App's like Stuff and the NZ Herald become hopeless to read - the tiniest flick and where you were reading is somewhere way way off the top of the screen. To over come this you need to drag, stop and lift your finger, kind of like dragging pages in a PDF with a mouse.
Possibly related to this is a tenancy to write garbled text messages. I am constantly getting keys outboard of the ones I want - like P's instead of O's and A's instead of S's etc. Center screen keys I have no trouble with. Some might say that this is due to my big sausage fingers, however I also have the Y300 which is a very similar phone also with a 4" 400x800 screen and have no problem with this. I find if I stab the screen, like it is resistive, accuracy improves (maybe it is averaging where I touch, and a more forceful touch centers better ?) I seem to get better accuracy on my U8150 which only has a 2.8" screen, so I am sure it is not me.
I am thinking of taking it back for my money back as it is sitting unused as I don't have the patients to put up with this behavior.
I decided to get one and a y300 from telecom and I can't say I have had any of those problems with text or scrolling. But the y300 is a way nicer phone in both build quality and performance and features.
Scrolling seems to be about the same as my other phones - if you give it a flick it screams along, move gently and it decelerates fine.
I have so far only really stuck a 32 gig card in it and synced a whole lot of music to use it as a music player.
Headphone output on the Y320 is totally hopeless, the Y300 is noticibly louder but still noway near enough and not as loud as the note 3 - been a ongoing problem with phones IME, the old nokia N95 was really good at driving headphones, and since then its been getting worse and worse. Probably those stupid europeans and their laws about max volume on things.
Out of 4 Huawei's I haven't had one with good volume or clarity yet.
I don't think that the android default MP3 player is any good for sound quality.
The best MP3 app I have found is Power Amp. Clarity, bass and volume a lot better all the other players that seem to use the default android mp3 API's. Unlike other players which browse exclusively by ID3 tag (artist, title etc) it can browse by folder which is brilliant if your MP3's are old or if their tags are all a mess. The only problem with Power Amp is that the trail expires after a month or so.
A tip when buying head phones for a quiet MP3 player: Look at the spec's on the back of the box to see how many ohms they are (symbol for ohms looks like a horse shoe). The lower the ohms the louder sound they will make at the same volume setting. Sony's are typically 16 ohms are give heaps of sound. Phillips, Panasonic etc tend to be 32 ohms and only make 1/2 the sound.
The thing is the Y320 is so low that is is unusable. This is on a cheap pair of senheisers - not sure on the impedance since they were cheap, and it was buy one get one free at noel's last wednesday so I got 2, one for me doing the lawns and one for a gift :)
Even on my ultimate ears it is still too quiet to even be usable.
Using google play music or rdio to play. The other options only play files you copy over to it which TBH I cannot be bothered doing.