I started using this because it was in my "to try" stash once my CG LashBlast WP dried out.
1) Adds definite length to my lashes! They're already fairly long but when I use this they just about touch my eyebrows!
2) Thin formula
3) Long, tapering brush with fairly stiff bristles makes it easy to wipe off excess product and pinpoint application on hard-to-reach areas like inner and outer corner lashes.
4) Price: it's around $6, and I often receive coupons for Maybelline eye products in the mail which makes this super affordable.
1) Brush bristles are long, which can cause the product to transfer to the eyelid.
2) Brush bristles are also widely spaced, which can clump sparse lashes together.
3) I experience some vertical clumping with my double-rowed lashes, which requires extra work and is somewhat annoying.
4) The formula is thin, so I find I have to apply two coats before applying a non-WP mascara to build up volume.
I usually use WP mascaras to 'set' the curl of my lashes before applying a non-WP mascara to build up volume. I find that doing this helps reduce and/or eliminate transfer from the regular mascaras and also makes the WP mascara easier to remove. I wipe excess product from the brush before applying to minimize clumping and transferring to the eyelid. I have double-rowed eyelashes that can be somewhat sparse at times so clumping for me is both horizontal along the lash line and vertical through my lash rows.
Because this is a lengthening formula, it's thin in order to coat the lash up to the very tips. The brush is long, tapered, and the bristles are long and have pretty wide spacing. If I don't wipe excess product off the wand, my lashes clump vertically and I have to run a long quilting pin horizontally through my lashes to separate them. Wiping the excess product off the wand also helps to avoid transfer to the eyelid from the long bristles going through the gaps in my lashes. The thin formula means that I have to use two coats, though, in order to prevent some wetter, heavier mascaras (looking at you, L'Oreal Voluminous Lash Paradise) from pulling out my curl somewhat.
As for performance, this mascara does what it says it does: it lengthens my lashes so that I look like I have kewpie doll eyelashes. Seriously, I look like I have Disney Princess lash length when I use it. When I use my HG (Smashbox Full Exposure) over it, my lashes are long, thick, and as close as I can get to false lashes without applying them. The hoops I have to jump through are minimal. Add to that its price--one of the cheaper DS mascaras I've found that's widely available--and this mascara has a permanent place in my routine.
Four stars for performance and price. If you have thicker natural eyelashes give this mascara a try.