The Slumberland Response Latex 2.0 Mattress is the Response Latex I'd send most people to, because it comes in Medium as well as Firm and Extra Firm. That opens the latex-over-pocket-springs build to side sleepers, which the 1.0 doesn't. Buy it in Medium if you sleep on your side and Firm if you sleep on your back, and check your fitted sheets before ordering, because it's 33cm deep.
More mini springs and more depth, with the same latex
It shares the 1.0's recipe: a quilted stretch-knit top with recycled fibre fillings, a graphite-infused latex layer, a comfort foam layer and two tiers of pocket springs. The difference is the upper tier, with 2000 mini pocket springs over 1250 full-height nested springs, where the 1.0 has 1500 minis. Bensons adds them up to 3250. I'd ignore the total, because the support comes from the 1250 underneath.
Expect a little more give near the surface than the 1.0 has, and the same lively latex response. Latex is cool, bouncy and long-lived, and it's the material I'd most like more people to try. You won't get stuck in it the way you can in deep memory foam, which suits anyone who turns over a lot.
At 33cm, standard fitted sheets won't reach. Buy deep-pocket sheets with it, and allow a couple of centimetres more if you use a protector.
Who should buy it, and in which grade
Light and average-weight side sleepers should pick Medium, so the shoulder and hip can sink a little into the latex before the springs take over. Back sleepers should pick Firm, and heavier and front sleepers Firm or Extra Firm. Couples get a reinforced edge and springs that keep a partner's turning on their side. There are no owner reviews for this model yet, so I'm judging the build, and it's a build I like.
Avoid it if latex doesn't agree with you, and avoid it if your frame or bedding can't take a 33cm mattress. And don't pay the sticker price. Slumberland is Bensons' own brand, built in its own factory, so there's nowhere else to compare it, and that makes the sale price the only number worth reading.
What to buy instead
If you're a back or front sleeper who wants firm, buy the 1.0 and skip the step up, since you'd be paying for comfort springs you won't use. If you'd rather not buy into a retailer's own brand, look for a latex-topped pocket-sprung mattress from a maker sold in several shops, so the price has something to be measured against.