Blends of PLA and PMMA have been reported to be miscible or partially miscible depending on blending procedures and composition. Nonetheless, the PLA within this blend has the ability to phase separate by crystallization thus concentrating PMMA in the amorphous regions. Already from this point of view, this blend system offers a very interesting scientific case study. The blend however may also offer interesting promises from an application point of view: the PLA fraction offers a biobased component, the blend remains transparent, the temperature resistance is improved relative to pure PLA and the final cost of the material may be reduced since PMMA is currently more expensive than PLA. This presentation summarizes findings gathered in the last 3 years on the phase behaviour of this blend in the melt and solid-state, on the basic mechanical performance, on the temperature resistance of the material and finally on the hydrolytic stability enhancement observed when adding PMMA to PLA. Some key unexpected findings were highlighted. In particular, the phase behavior was process-history dependant indicating that the miscibility of the blend may not really be an equilibrium state. This was supported by thermal analysis but also by highly intriguing behavior and creation of nanometric pore structure during accelerated hydrolysis testing of the material. The presentation will aim at presenting our current understanding of this interesting blend system and to assess the usefulness and potential of this blend for engineering applications.