I've used HKS speedloaders for a while, but have recently switched over to Safariland for carry. They are a bit smaller (at least the Comp I) and I like the release method better than the one HKS uses (it's faster and easier, at least for me).
I carry Bianchi speed strips as well, but only as a back-up to a speedloader or when hiking/camping to keep the bulk to a minimum. No matter how much I practice, I find the Safariland Comp I much faster than speed strips so I trade off a little bulk for better performance.
The good thing about all these options, is that they are quite cheap, so you can get one of each to try out and give away the ones that don't work for you (or just use them at the range, or as back-up).
Now hatred is by far the longest pleasure;
Men love in haste, but they detest at leisure.
- Lord Byron (George Gordon Noel Byron), Don Juan
(canto XII, st. 6)