From her:
For daily use items, I prefer to buy in bulk--it saves money and usually prevents running out of the item suddenly. This is definitely a concern when it comes to lube, since running out of it in a pinch is a disappointment for all involved. ID Glide is a standard water-based lube that performs well in a variety of situations. After about seven months of continuous use the 9.5oz bottle that my partner and I share is currently a little more than a third full. I anticipate having to buy a second bottle in another couple of months. To give you an idea of what "continuous use" means to us, we use this lube on a regular basis, at least six times a week, for a variety of sexual acts. These include anal sex, fingering, and fisting, PIV sex, and masturbation and/or insertion of toys. For each activity, anywhere from a dime-sized amount to a palm-sized amount is used, and depending on the type of activity, re-application may be necessary. For example, it is not typically necessary for us to re-apply when it comes to PIV, unless we're going for more than 30 minutes continuously. However, it is necessary to re-apply frequently for any type of anal activity. Water based lube dries relatively quickly. I don't find this detracts from the experience enough to switch to another lube, though. The only activity that I would say ID Glide is more or less totally unsuited for is penile masturbation - it dries far too quickly, and as it dries it becomes very sticky, rendering it totally useless. Thus, on my partner, I prefer to use plain old spit.

Though this type of Glide is listed as unflavored, I find it to have a slightly sweet taste. I would recommend not to perform oral after using it if you find the taste (as I do) unpleasant. I also keep tissues on hand to use after applying the lube during sex and pegging because I don't like the way it dries on my fingers and I'm leary of just wiping it on my sheets. It leaves very light water stains on our beige sheets. I prefer not to have to launder them every few days. The stains do come right out in the wash. I haven't had any issues with UTIs or yeast infections since using ID Glide on a regular basis, which is a definite plus.

From him: I've been very appreciative of having a large bottle of lube around, mainly due to the rigorous things we do with it. It has been said that there is always time for lubricant and I wholeheartedly agree. The bottle is easy to use. It has a simple flip cap to the top, no complicated moving parts and easy access with dry or slippery hands. The lube doesn't run when temperatures creep up and it stays put mostly where you choose to use it in the first place.

We're still working our way through the bottle and it's still holding up as reliably as we need it to. No complaints.