I have a solid bikini top, and it's the only top of any kind that I use from March through October. Therefore, if I need rain protection, that's what I have. It doesn't provide much, but it provides more than nothing at all. There's a huge difference, IMHO, between the Bikini top and a full soft top with the sides and back rolled up (and doors off, I assume). Firstly, the full top even rolled, etc. will cover about 2x as much area. Secondly, you have to fool with all the hardware being up with the full top up, but not with the bikini (to me, that's a major issue when off-roading in a forested environment where you're scraping against trees, etc.). Thirdly, the full top is such a PITA to put up/on and take off/down. The bikini is two minutes on (much less if a friend helps), and fifteen seconds off--and you can stash it under a seat when it's off.
locked front and rear