I have the old version of the widepac 3l. It is a good bladder and has already lasted twice as long as all my other makes of bladder combined (platy and camelback). The only thing is that this winter the bite valve froze and since I was thirstyI just bit and bit until the ice was broken and the water could flow. This introduced holes to the rubber but it still was ok. The only problem with the old bite valve is that the seal was more mechanical, i.e. it was aflexible parallelogram that you bit to open it up. This seemed to relax over time and I now have to blow the water back after drinking and push the rubber housing back firmly onto the internal bite seal mechanism. The new one is different from the photo so I will probably get it to try out.
The removeable tube is great but does leak no mater how hard you try to blow back any remaining water into the bladder. It also makes it easy to feed the tube into your sack through the bladder opening or feed tubes without having to pass the bite valve through. It does not leak. The new version is slightly different in looks but I would guess the old and the new tubes are interchangeable if needed.
I don't look after bladders too well and so far this one has not had any of the usual black, feathery growths in the tube that move when you drink from the bladder. This usually happens because I don't clean it out only give a bit of a rinse to the bladder part when re-filling. This one has already outlasted all other bladders and and still hasn't failed or leaked. If this was not good enough it has not fouled up in any way. The bladder has no blackened bits in the tube or bladder and has no growths or taints in it.
My advice is to replace your old bladders as soon as they fail with this one (or the 1l or 2l as needed). It is currently the best bladder out there in my humble opinion. BTW I have nothing to do with the company or distributers of source. I have just found it to be the only one that works with me. I mean how many of you really clean and disinfect the bladders after use then put in the freezer for storage? IF you don;t do this then IME source is the only bladder for you.