I don't know about ALL the level A manipulatives (we started with level E, we're now using level A with my daughter but anything we didn't have for my older son we're using our own materials... some detailed below) but I can comment on much of it.
The plastic toys are just that -- plastic toys. You get what you get. Not to say that they're BAD, they're certainly not crap. We have the balance scale and we LOVE LOVE LOVE it. The clock I think is like any other cheap plastic learning clock. I'm just getting a similar clock from a Canadian company (saves shipping for me), if I were in the US I'd probably buy it from RS.
The abacus is nice. We have the Junior (plastic) and the Classic (wooden). I love the wooden one... We did have a problem with it, where some of the beads kind of stick to the wire... apparently this is a fairly common issue, they need to be worked for a bit and then they loosen up. I think it's from the paint inside the little hole...
The place value cards - I never got those. I think they're typical plastic-coated cards. I splurged and got some wooden Montessori place value cards from elsewhere... durable, beautiful, more tactile, etc.
The abacus tiles weren't great, I'll be honest. They were a LOT of work for me to put them together, then within the first lesson using them, my ADHD son had totally squashed them. Yeah.... Once again, I splurged and got wooden Montessori 100's tiles. The RS ones are inexpensive and handy, but they're just cardstock - not even laminated. A rough child will wreck them pretty quick.
The math games cards are great. Again, they're just laminated cardstock, but they're as heavy as typical playing cards. And they won't squash like the abacus tiles lol... We did lose a few, and so I bought a second set... it's nice having extras.

I can't comment on their geoboards. They didn't come with level E, and for my daughter I'm buying different ones from Canada, like with the clock.
The coloured tiles -- have been great! The package comes with LOTS of them. I'm sure we've lost some, but there's still plenty to go around. They're solid plastic and fun, lots of things we use them for. DD loves making patterns with them, we used them for the first counting activities in level A, DS still uses them sometimes when he needs a reminder of how area works, etc.
Geometry reflector -- same as the geoboards and clock, we're getting a different one, solely because of shipping to Canada.
Tally sticks -- they're just popsicle sticks. They work great, of course, but if you can find them cheaper go for it. $2 for 50 isn't bad, of course. Again, we didn't get any with the level E kit, so we used craft sticks we already had. And then I actually bought some more, specifically for math (both for tally sticks and for spindles for a Montessori spindle box) -- these ones are narrower, and are squared off at the ends. I like them even better for tally sticks than "regular" popsicle/craft sticks.

I think that covers everything... So in general, I was pleased with the quality for the price... some things are just cardstock, but that's what you're paying for. Any other questions?