We have the Britax "Parkway" boosters... VERY great and happy with it. I prefer the "Parkway" than the "Regent." We also have the "Compass" boosters.
(The Parkway & "Compass" boosters does not lean back, it sits straight up. My daughter says it is very comfortable and likes it. My kids like all these boosters we have... for our van, Grandma's car, and for Aunty's car).
ALSO, very highly rated are the "Clek" brand boosters. VERY good ratings, and more affordable. My friend got some, more than one, and is very happy with it. You can get the "Clek" boosters on Amazon.... and it has FREE shipping as well. Cute designs too. The Clek has a latch system.
The Clek is also great for traveling.
The "Compass" brand boosters are also very good, and award-winning, and highly rated. And well priced. We have these as well, for Grandma's car. It is also folding, for traveling. You can also get these on www.amazon.com and many of the styles come with "FREE" shipping.
These are my recommendations.... very happy with these products, and all highly rated.
Don't go by price point... the boosters I mentioned are all under $100 or a little more. These that I mentioned are ALL very highly rated... by consumers and those "agencies" that rate them.
My friend HAD the Britax Regent... but didn't care for it... it was bulky in her SUV... it sat too close to hte front passenger seat and did not lend itself to much leg room, and her kid grew out of it. She then got the "Compass" and "Clek" brand.
For all of the brands I mentioned, I bought it on Amazon, because it was "free" shipping, AND it was cheaper buying it on Amazon, than in my local stores. The local stores in my city were LOTS more expensive.
My girl is almost 6 years old, about 50 pounds and about 46" high. My son is about 2 years old, and 38" high and about 32 pounds. For my 2 year old... the specifications of the "Compass" booster seat is the meeting guidelines for him. We have him in the Compass for when he is in Grandma's or Aunty's car, and in a regular "baby" convertible car seat in our van. My girl uses the "Parkway." It fits them both well. We have had the Parkway for about 2-3 years, and the Compass for a couple of months.
But yes, the Regent 5-point boosters are more expensive, if that is the only factor in your decision.
Good luck,
Susan