The cheaper membrane version of the Sova goes for $150 (with the mechanical version selling for $199). For the Lapdog, its MSRP is $119 – but this doesn’t include a mouse and keyboard, and Corsair is listing it for $70 right now. Corsair offers bundles with a mechanical keyboard for more money (a mouse isn’t included with any of Corsair’s options). Razer’s offering is priced similarly then, but the biggest difference between the Razer Turret and other options is the size — the Turret is substantially smaller. This makes it portable and easier to store, but it also gives you less room to work with.
As for the dimensions of the keyboard, you’re looking at 20-inches long when open and 11.6 inches when closed. It’s 4.7-inches wide, and .4-inches tall. As mentioned in the intro, it’s fairly small. The most worrisome dimension for PC gamer is that width. The Corsair Lapdog and Sova are 11-inches wide, meaning there’s a lot more room to move around.