Perfect beaker/cup for a toddler?

[elk4baby]

Seems Pushchairs has the most visitors, so trying my luck here:

It seems I've tried every cup on the market, but haven't found the perfect one . The baby cup (Tommee Tippee Xplora) was good, but is now too small for my 15m.o.
I've tried the Tomy Moma cup, which is pretty good. But DS somehow managed to break ours - dropping on the floor constantly.
So after the Moma, I splashed out on the Safe Sippy - stainless steel. It's actually quite good, as it doesn't break and doesn't become 'slimy' after a few hours like the plastic ones. However (of course there is one), I put milk in ours (full fat) and after a couple of weeks of this the silicone valve started to slip off from under the cap (even though I've washed it in very hot water with washing up liquid). So now we use it as a straw cup and this valve is yet to give up... but if it does, I'm not sure what to move on to from here .

Has anyone found the 'perfect' cup?! One that would work well with milk and wouldn't get all slimy when using it with water?

We just use the simple ones with a flip down free flow spout like this one or this one. They are easy to use and clean and usually pretty cheap too. We also have several even more simple and cheap ones where the lid is a one piece moulded free flow spout (bought pack of 3 for 99p last time I was in asda).

We just use the simple ones with a flip down free flow spout like this one or this one. They are easy to use and clean and usually pretty cheap too. We also have several even more simple and cheap ones where the lid is a one piece moulded free flow spout (bought pack of 3 for 99p last time I was in asda).

Avent magic sports cup is working really well for DS who is 17 months.

Anyway up cups have been great for our ds's from about 12 months.

Boon Fluid Cup for Water or Juice
Born Free Trainer Cups for Milk
(and that is after trying almost every product on the market with 4 children!!!)
Boon cups are hard to suck at first until they've been used and dishwashered about a week. They then "ease up" a bit. They do drip a little (only if left upside down) - but on the plus side - tops clip on and off easily - and they're really easy to clean hygenically.
Born free cups are fantastic for milk - you could also use for water - but my previously breastfed child wants a seperate container for his milk - and won't take milk from the boon or water from the born free!