Can you ever trust a company's own after market product with a car seat?

[HeliMom]

My almost 3 year old is almost meeting the RF weight limit on her Britax Boulevard  and I was looking into getting her a Diono Radian but our car is a compact and I've heard they can take up a lot of room front to back. I saw Diono also makes this angle adjuster http://us.diono.com/en/car-seat-accessories/angle-adjuster  I know after market products are a safety no no regardless of whether it says its crash tested. I wasn't sure though if you can trust the a product the company designed for use with it's own carseats. 

Thank you very much in advance for your wisdom.

[chel]

This is the same company that makes the mighty-tight device that is well known to be not so great.

Personally, I take things on a case by case.  So I would use the base just as I would use a pool noodle.

[alegna]

In general I stay away from after market products, but this is one I would feel comfortable using.

FWIW it's basically the *opposite* of a pool noodle (and I don't think noodles are allowed with the radian?  thought I remembered something about that....)

[Maedze]

The Angle Adjuster and the Mitey Tite are NOT comparable.  

The Mitey Tite is an aftermarket product for the seatbelt.  Despite Diono's claim, it doesn't matter that they've 'crash tested' it because you cannot 'crash test' something that affects seatbelt function per FMVSS 213.  No way to do it.   Mitey Tites damage seat belts.  Thats why they are dangerous and can never be used. 

The Angle Adjuster is specifically designed for the Radian, and has nothing to do with the function of the vehicle.  Diono *can* crash test the Radian with the Angle Adjuster and all that matters is that all perimeters of testing stay within their safe brackets.  Make sense?   

[~Adorkable~]

i have recently put two Radians in our SUV and needed the angle adjuster or they would simply not fit. after putting them in i have no issues with them for a few reasons.

they really just act like a new top to the seat but only under the front and not the rear area, thus allowing the rear area to sit lower than the rest and thus changing the angle, since the pivot point for the seat is the rear area, the seat is just as tightened down with the angle adjuster in place as it is without it. you can actually put the seat in, tighten it down and then lift the front and slide the adjuster in almost. and then you tighten the backside of the seat that is forward with the top tether. it is rock solid.

after tightening it down fully both ways (without it requires me to move my front seats to a unusable position, but i did it once to see what it was like) it is actually more stable with the adjuster in place , since it is a smooth flat firm non slip base for the seat to rest on. it sinks in just enough to grab good and does not wobble. in contrast my actual seat had curves and the location of the latch system does not center the radian on the seat totally  so it was a bit tippy. 

i think i would use it even if i didn't need it, really